When no margin detected, reserve a bit more space for comments

copienator/annotation_layout.py

@@ -0,0 +1,75 @@
+"""Answer provenance and reproducible annotation spacing (200 dpi pixels)."""
+from hashlib import sha256
+from pathlib import Path
+import shutil
+
+import pymupdf
+
+from copienator import configuration
+from copienator.json_io import atomic_write_json, read_json
+
+
+def fingerprint(path):
+    return sha256(Path(path).read_bytes()).hexdigest()
+
+
+def metadata_path(pdf):
+    return Path(pdf).with_suffix('.layout.json')
+
+
+def answer_parts(pdf):
+    """Ignore stale sidecars after a PDF is replaced or manually edited."""
+    if pdf is None or not Path(pdf).is_file():
+        return []
+    try:
+        data = read_json(metadata_path(pdf), default={})
+        if data.get('sha256') == fingerprint(pdf):
+            parts = data.get('parts', [])
+            if isinstance(parts, list) and all(isinstance(part, dict) for part in parts):
+                return parts
+    except (OSError, ValueError, TypeError, AttributeError):
+        pass
+    return []
+
+
+def save_parts(pdf, parts):
+    atomic_write_json(metadata_path(pdf), {
+        'version': 1, 'sha256': fingerprint(pdf), 'parts': parts,
+    })
+
+
+def page_parts(pdf):
+    parts = answer_parts(pdf)
+    if not Path(pdf).is_file():
+        return []
+    with pymupdf.open(pdf) as document:
+        if len(parts) == len(document):
+            return parts
+        return [{'margin_status': 'unknown'} for _ in document]
+
+
+def copy_answer_pdf(source, destination):
+    parts = answer_parts(source)
+    shutil.copy(source, destination)
+    save_parts(destination, parts)
+
+
+def move_answer_pdf(source, destination):
+    parts = answer_parts(source)
+    shutil.move(str(source), str(destination))
+    save_parts(destination, parts)
+    metadata_path(source).unlink(missing_ok=True)
+
+
+def layout_for(pdf):
+    low = any(part.get('margin_status') == 'low' for part in answer_parts(pdf))
+    margin = (configuration.ANNOTATION_LOW_MARGIN_LEFT if low
+              else configuration.ANNOTATION_MARGIN_LEFT)
+    if type(margin) is not int or margin < 0:
+        raise ValueError('Annotation left margins must be non-negative integers')
+    return {'version': 1, 'margin_left': margin, 'narrow_left_pad_limit': 300}
+
+
+def legacy_layout():
+    # Old annotation scans were produced with these literal constants.
+    return {'version': 1, 'margin_left': 300, 'narrow_left_pad_limit': 300}

copienator/annotation_modifications.py

@@ -155,7 +155,7 @@ def output_removals(directory: Path) -> tuple[str, ...]:
     info = read_json(directory / "info.json") if (directory / "info.json").exists() else {}
     return ("Concat.jpg", "Concat_F.jpg", "Concat_F.pdf", "touched.json", "answer_labels.json",
             *(f"{label}.jpg" for label, entry in info.items()
-              if entry.get("not_empty") and Path(label).name == label))
+              if Path(label).name == label))
 
 
 def rebuild(root: Path, mode: str, directory: Path, staging: Path, meta: dict,
@@ -169,7 +169,15 @@ def rebuild(root: Path, mode: str, directory: Path, staging: Path, meta: dict,
 
     headers, bodies, changed = edited_bodies(directory, meta, instructions)
     info = deepcopy(meta["info"])
-    filtered = set(meta["filtered"]) | changed
+    for label, entry in info.items():
+        # Retained empty scans are images, not evidence of a non-empty answer.
+        entry["not_empty"] = label in bodies and (entry["not_empty"] or label in changed)
+        if label in changed:
+            entry["present"] = label in bodies
+        entry["score"] = scores.get(label, entry["score"])
+    filtered = (set(meta["filtered"]) | changed) & {
+        label for label, entry in info.items() if entry["not_empty"]
+    }
     all_labels = utils.read_all_labels(root)
     images, groups = [], []
     seen_contexts = set()
@@ -187,15 +195,13 @@ def rebuild(root: Path, mode: str, directory: Path, staging: Path, meta: dict,
                                         fill="black", font_size=30)
         image = stack([header, body])
         image.save(staging / f"{label}.jpg")
+        if info[label]["not_empty"]:
             images.append(image)
         if label in filtered:
             extras = get_extra_pdfs_as_images(root, label, annotating, all_labels,
                                             seen_contexts=seen_contexts) if mode == "BGnot" else []
             groups.append([*extras, image])
     for label, entry in info.items():
-        entry["not_empty"] = label in bodies
-        if label in changed and label in bodies:
-            entry["present"] = True
         entry["touched"] = mode == "BGnot" and label in bodies and label in filtered
         entry["score"] = scores.get(label, entry["score"])
     atomic_write_json(staging / "info.json", info)

copienator/commands/annotating.py

@@ -35,9 +35,9 @@ from copienator.commands.import_annotations import clear_import_directory
 from copienator.answer_info import build_answer_info
 from copienator.filesystem import staged_directory
 from copienator.feedback_boxes import valid_feedback_box
+from copienator.annotation_layout import layout_for
 from copienator.utils import natural_key
 
-MARGIN_LEFT = 300
 ANNOT_WIDTH = 600
 
 
@@ -321,7 +321,7 @@ def compose_label_image(base_img, label, result, hmin,
                         with_error=True,
                         with_empty=False,
                         more_right=False,
-                        with_id=None, source_pdf=None):
+                        with_id=None, source_pdf=None, layout=None):
     """
     Composes the final image with annotations.
 
@@ -350,10 +350,12 @@ def compose_label_image(base_img, label, result, hmin,
                 context = f"Copie : {with_id} — {context}"
             raise AnnotationLatexError(f"{context}\n{exc}") from exc
 
+    layout = dict(layout if layout is not None else layout_for(source_pdf))
+    margin_left = layout['margin_left']
     left_pad = 0
     if base_img.width < TARGET_MIN_WIDTH:
         total_missing = TARGET_MIN_WIDTH - base_img.width
-        left_pad = min(total_missing, MARGIN_LEFT)
+        left_pad = min(total_missing, layout['narrow_left_pad_limit'])
 
         new_base = Image.new("RGB", (TARGET_MIN_WIDTH, base_img.height), "white")
         new_base.paste(base_img, (left_pad, 0))
@@ -409,7 +411,7 @@ def compose_label_image(base_img, label, result, hmin,
     total_height = base_img.height + header_height
 
     # Create Canvas
-    final_img = Image.new("RGB", (base_img.width + MARGIN_LEFT, total_height), "white")
+    final_img = Image.new("RGB", (base_img.width + margin_left, total_height), "white")
 
     # Draw Headers
     current_y = 0
@@ -431,7 +433,7 @@ def compose_label_image(base_img, label, result, hmin,
 
     # Paste Base Image
     image_offset_y = current_y
-    final_img.paste(base_img, (MARGIN_LEFT, image_offset_y))
+    final_img.paste(base_img, (margin_left, image_offset_y))
 
     # 2. Draw Local Annotations
     draw = ImageDraw.Draw(final_img, "RGBA") # Refresh draw object
@@ -443,8 +445,8 @@ def compose_label_image(base_img, label, result, hmin,
 
         target_ymin = (ymin - hmin) + image_offset_y
         target_ymax = (ymax - hmin) + image_offset_y
-        target_xmin = xmin + MARGIN_LEFT + left_pad
-        target_xmax = xmax + MARGIN_LEFT + left_pad
+        target_xmin = xmin + margin_left + left_pad
+        target_xmax = xmax + margin_left + left_pad
 
         # Draw Rectangle (if not suppressed)
         if "norectangle" not in fb:
@@ -485,6 +487,7 @@ def compose_label_image(base_img, label, result, hmin,
 
         last_text_bottom = paste_y + txt_img.height
 
+    final_img.info['annotation_layout'] = layout
     return final_img, header_height
 
 def process_student(student_id, labels_data, root_dir, all_labels, overwrite):
@@ -544,14 +547,13 @@ def process_student(student_id, labels_data, root_dir, all_labels, overwrite):
         if label_images:
             max_w = max(image.width for image in label_images)
             total_h = sum(image.height for image in label_images)
-            canvas = Image.new('RGB', (max_w, total_h))
+            canvas = Image.new('RGB', (max_w, total_h), 'white')
             current_y = 0
             for image in label_images:
                 canvas.paste(image, (0, current_y))
                 current_y += image.height
             canvas.save(staging / "Concat.jpg")
-        elif labels_data:
-            problems = True
+        # An all-empty copy still has valid individual return images.
     return "partial" if problems else "success"
 
 

copienator/commands/annotating_by_label.py

@@ -87,6 +87,7 @@ def save_batch(batch, prefix, group_id, output_root: Path) -> None:
                 "id": student_id,
                 "label": label,
                 "header_height": header_height,
+                "layout": image.info.get('annotation_layout', annotating.layout_for(None)),
                 "hmin": current_y,
                 "hmax": current_y + image.height,
             }

copienator/commands/annotating_with_checks.py

@@ -196,6 +196,7 @@ def _render_student(
                 "id": student_id,
                 "label": label,
                 "header_height": header_height,
+                "layout": final_image.info.get('annotation_layout', annotating.layout_for(None)),
                 "img_h": final_image.height,
             }
         )

copienator/commands/correction.py

@@ -7,7 +7,6 @@ import json
 import os
 import signal
 import shlex
-import shutil
 import sys
 import threading
 import time
@@ -20,6 +19,7 @@ from google.genai import types
 from copienator import configuration as config
 from copienator.commands import grouping
 from copienator.answer_origins import save_origins
+from copienator.annotation_layout import copy_answer_pdf, move_answer_pdf
 from copienator import prompting
 from copienator.gemini_config import fresh_seed, thinking_config
 from copienator import configuration as settings
@@ -427,10 +427,10 @@ def handle_label_errors(pid, label, res, pdf_path):
             tprint(f"\t\tCopie{pid} : moving wrong {label} to {new_label}.")
 
             # Copie vers _new, puis renommage de l'original vers _old
-            shutil.copy(str(pdf_path), str(new_pdf_path))
+            copy_answer_pdf(pdf_path, new_pdf_path)
             old_pdf_path = pdf_path.with_name(f"{label}_old.pdf")
             if pdf_path != old_pdf_path:
-                shutil.move(str(pdf_path), str(old_pdf_path))
+                move_answer_pdf(pdf_path, old_pdf_path)
 
             idx = reserve_next_group_idx(new_label)
             height = grouping.get_pdf_height(str(new_pdf_path))
@@ -464,7 +464,7 @@ def handle_label_errors(pid, label, res, pdf_path):
             add_pdf_path = COPIES_DIR / f"Copie{pid}" / f"{add_label}_new.pdf"
 
             if not base_add_pdf_path.exists() and not add_pdf_path.exists():
-                shutil.copy(str(pdf_path), str(add_pdf_path))
+                copy_answer_pdf(pdf_path, add_pdf_path)
                 save_origins(INPUT_DIR, pid, add_label, add_pdf_path, [label])
                 tprint(f"\t\tCopying Copie{pid} : {label} -> {add_label}")
                 idx = reserve_next_group_idx(add_label)
@@ -578,7 +578,7 @@ def process_single_task(task_tuple, precomputed_response=None):
                 if res.get("error") == "empty-answer":
                     old_path = pdf_path.with_name(f"{label}_old.pdf")
                     if pdf_path.exists() and pdf_path != old_path:
-                        shutil.move(str(pdf_path), str(old_path))
+                        move_answer_pdf(pdf_path, old_path)
                         pdf_path = old_path
                     current_suffix = "_old"
 
@@ -729,10 +729,10 @@ def resolve_delayed_moves():
                                 res["suffix"] = "_old" # Fixed typo: was suffixe
                                 resolved_any = True
 
-                                shutil.copy(str(pdf_path), str(new_pdf_path))
+                                copy_answer_pdf(pdf_path, new_pdf_path)
                                 old_pdf_path = pdf_path.with_name(f"{label}_old.pdf")
                                 if pdf_path != old_pdf_path:
-                                    shutil.move(str(pdf_path), str(old_pdf_path))
+                                    move_answer_pdf(pdf_path, old_pdf_path)
 
                                 idx = reserve_next_group_idx(target_label)
                                 height = grouping.get_pdf_height(str(new_pdf_path))
@@ -751,7 +751,7 @@ def resolve_delayed_moves():
                                 res["error"] = res["error"].replace(f"(xx){target_label}", f"(->){target_label}")
                                 resolved_any = True
 
-                                shutil.copy(str(pdf_path), str(add_pdf_path))
+                                copy_answer_pdf(pdf_path, add_pdf_path)
                                 save_origins(INPUT_DIR, pid, target_label, add_pdf_path, [label])
                                 idx = reserve_next_group_idx(target_label)
                                 height = grouping.get_pdf_height(str(add_pdf_path))

copienator/commands/cutleft.py

@@ -29,6 +29,7 @@ from copienator.filesystem import staged_files
 from copienator.copy_errors import clear_copy_error, mark_copy_error, marked_copy_paths
 from copienator.configuration import SHOW_PERSONAL_STEPS
 from copienator.left_margin import analyse_margins
+from copienator.annotation_layout import fingerprint
 
 DELIMITER_WIDTH = 5
 DELIMITER_COLOR = (0, 0, 0)
@@ -211,6 +212,8 @@ def save_results(
 ) -> None:
     """Atomically replace every Cutleft output associated with one copy."""
     _, splits, schema = result
+    if pdf_path.is_file():
+        schema = {**schema, 'source_sha256': fingerprint(pdf_path)}
     base_name = pdf_path.stem
     previous = _previous_cutleft_outputs(output_dir, base_name)
     with staged_files(output_dir, remove=previous) as staging:

copienator/commands/reading_annotations.py

@@ -22,6 +22,7 @@ from copienator import (
 )
 from copienator.annotation_actions import apply_checkbox_actions, apply_score_overrides
 from copienator.annotation_data import AnnotationData, load_annotation_data
+from copienator.annotation_layout import legacy_layout
 from copienator.annotation_modifications import (
     BASELINE,
     output_removals,
@@ -157,10 +158,14 @@ def apply_actions_and_regenerate(
     """Apply annotations and atomically merge the regenerated student files."""
     output_dir = workspace.annotation_dir("checks") / f"Copie{student_id}"
     bnote_path = output_dir / "bnote.json"
-    if not bnote_path.is_file():
+    only_empty = bool(data[student_id]) and all(
+        content["result"].get("error") == "empty-answer"
+        for content in data[student_id].values()
+    )
+    if not bnote_path.is_file() and not only_empty:
         print(f"  Missing {bnote_path}")
         return ExitCode.PARTIAL
-    bnote_data = read_json(bnote_path)
+    bnote_data = read_json(bnote_path) if bnote_path.is_file() else {"images": []}
     if not isinstance(bnote_data, dict):
         raise TypeError(f"Expected a JSON object in {bnote_path}")
 
@@ -180,7 +185,14 @@ def apply_actions_and_regenerate(
     filtered: list[Image.Image] = []
     incomplete = False
 
-    for image_info in bnote_data.get("images", []):
+    review_images = list(bnote_data.get("images", []))
+    reviewed_labels = {str(item.get("label", "")) for item in review_images if isinstance(item, dict)}
+    # Empty answers are omitted from the review sheet, but still need return images.
+    review_images.extend(
+        {"label": label} for label, content in labels_data.items()
+        if label not in reviewed_labels and content["result"].get("error") == "empty-answer"
+    )
+    for image_info in review_images:
         if not isinstance(image_info, dict):
             incomplete = True
             continue
@@ -191,11 +203,10 @@ def apply_actions_and_regenerate(
         content = labels_data[label]
         result = content["result"]
         scores[label] = str(result.get("score", 0))
-        if result.get("error") == "empty-answer":
-            continue
+        is_empty = result.get("error") == "empty-answer"
 
         sub_note = None
-        if notes_layer is not None:
+        if notes_layer is not None and "hmin" in image_info:
             hmin = int(image_info.get("hmin", 0))
             hmax = int(image_info.get("hmax", 0))
             sub_note = notes_layer.crop((0, hmin, notes_layer.width, hmax))
@@ -213,6 +224,9 @@ def apply_actions_and_regenerate(
             result,
             content["coordinates"][0],
             with_error=False,
+            with_empty=True,
+            source_pdf=pdf_path,
+            layout=image_info.get('layout', legacy_layout()),
         )
         if final_image is None:
             incomplete = True
@@ -230,6 +244,8 @@ def apply_actions_and_regenerate(
 
         dirty_images[label] = final_image
         header_heights[label] = new_header_height
+        if is_empty:
+            continue
         answer_labels.append(label)
         concatenated.append(final_image)
         if float(scores[label]) != 4.0 or result.get("feedback", []):
@@ -302,13 +318,15 @@ def run(
     status = ExitCode.PARTIAL if loaded.warnings else ExitCode.SUCCESS
     for student_id in sorted(loaded.data, key=utils.natural_key):
         output_dir = workspace.annotation_dir("checks") / f"Copie{student_id}"
-        if not output_dir.is_dir():
+        only_empty = all(content["result"].get("error") == "empty-answer"
+                         for content in loaded.data[student_id].values())
+        if not output_dir.is_dir() and not only_empty:
             print(f"Warning: missing annotation directory {output_dir}")
             status = ExitCode.PARTIAL
             continue
         print(f"Processing annotations for: {student_id}")
-        actions, notes = detect_checks_and_notes(output_dir)
-        if notes is None and not actions and not update_score:
+        actions, notes = ([], None) if only_empty else detect_checks_and_notes(output_dir)
+        if notes is None and not actions and not update_score and not only_empty:
             print("  No readable annotation input found.")
             status = ExitCode.PARTIAL
             continue

copienator/commands/reading_grouped_annotations.py

@@ -25,6 +25,7 @@ from copienator import (
 )
 from copienator.annotation_actions import apply_checkbox_actions, apply_score_overrides
 from copienator.annotation_data import AnnotationData, RefaireList, load_annotation_data
+from copienator.annotation_layout import legacy_layout
 from copienator.annotation_modifications import (
     BASELINE,
     baseline,
@@ -168,7 +169,6 @@ def _scan_annotation_directory(
     if notes_image is None:
         if required:
             raise ValueError(f"Could not read annotations in {directory}")
-        return {}, {}
     actions_by_student: dict[str, list[dict[str, Any]]] = defaultdict(list)
     notes_by_student: dict[str, LabelNotes] = defaultdict(dict)
     for action in actions:
@@ -181,11 +181,12 @@ def _scan_annotation_directory(
         hmin = int(image_info.get("hmin", 0))
         hmax = int(image_info.get("hmax", 0))
         if student_id and label and hmax > hmin:
-            crop = notes_image.crop((0, hmin, notes_image.width, hmax))
-            if has_significant_notes(crop):
+            crop = (notes_image.crop((0, hmin, notes_image.width, hmax))
+                    if notes_image is not None else None)
             notes_by_student[student_id][label] = {
-                    "img": crop,
+                "img": crop if has_significant_notes(crop) else None,
                 "old_header_h": int(image_info.get("header_height", 0)),
+                "layout": image_info.get('layout', legacy_layout()),
             }
     return dict(actions_by_student), dict(notes_by_student)
 
@@ -292,8 +293,7 @@ def apply_actions_and_regenerate_grouped(
             result["score"] = old_scores[label]
         scores[label] = str(result.get("score", 0))
         touched[label] = False
-        if result.get("error") == "empty-answer":
-            continue
+        is_empty = result.get("error") == "empty-answer"
         saved_image = output_dir / f"{label}.jpg"
         baseline_entry = (previous_baseline or {}).get("images", {}).get(label)
         if selected_labels and label not in selected_labels and (saved_image.is_file() or baseline_entry):
@@ -319,6 +319,8 @@ def apply_actions_and_regenerate_grouped(
                 )
             dirty_images[label] = final_image
             scores[label] = str(old_scores.get(label, scores[label]))
+            if is_empty:
+                continue
             concat_images.append(final_image)
             answer_labels.append(label)
             filtered_labels.append(label)
@@ -344,6 +346,9 @@ def apply_actions_and_regenerate_grouped(
             result,
             content["coordinates"][0],
             with_error=False,
+            with_empty=True,
+            source_pdf=pdf_path,
+            layout=label_notes.get(label, {}).get('layout', legacy_layout()),
         )
         if final_image is None:
             incomplete = True
@@ -368,6 +373,8 @@ def apply_actions_and_regenerate_grouped(
         # Persist every final block, including unchanged answers, for returns.
         dirty_images[label] = final_image
         header_heights[label] = new_header_height
+        if is_empty:
+            continue
         answer_labels.append(label)
         concat_images.append(final_image)
 

copienator/commands/resolve_manual.py

@@ -2,7 +2,6 @@ from __future__ import annotations
 
 import argparse
 import re
-import shutil
 from collections.abc import Sequence
 from dataclasses import dataclass
 from pathlib import Path
@@ -10,6 +9,8 @@ from typing import Any
 
 from pypdf import PdfWriter
 from copienator.pdf_cut import split_pdf
+from copienator.annotation_layout import (copy_answer_pdf, move_answer_pdf,
+                                         page_parts, save_parts, metadata_path)
 from copienator.answer_origins import origins_for, save_origins
 
 from copienator import (
@@ -240,6 +241,8 @@ def resolve_manual(workspace: EvaluationWorkspace) -> ExitCode:
                 if not instruction.cut and instruction.operator == "->":
                     origins[key_new] = list(dict.fromkeys([
                         *origins[key_new], instruction.old_label]))
+                source_parts = page_parts(source)
+                destination_parts = page_parts(destination)
                 writer = PdfWriter()
                 try:
                     if instruction.pipe_first:
@@ -251,8 +254,11 @@ def resolve_manual(workspace: EvaluationWorkspace) -> ExitCode:
                             writer.append(destination)
                         writer.append(source)
                     writer.write(temp_output)
+                    save_parts(temp_output, (source_parts + destination_parts
+                                             if instruction.pipe_first else destination_parts + source_parts))
                 except Exception:
                     temp_output.unlink(missing_ok=True)
+                    metadata_path(temp_output).unlink(missing_ok=True)
                     raise
                 finally:
                     writer.close()
@@ -264,12 +270,13 @@ def resolve_manual(workspace: EvaluationWorkspace) -> ExitCode:
                     [instruction.old_label] if instruction.operator == "-x"
                     and not instruction.cut else []
                 )
-                shutil.copy(source, temp_output)
+                copy_answer_pdf(source, temp_output)
                 current_paths[key_new] = temp_output
                 temp_files.append(temp_output)
     except Exception:
         for temporary in temp_files:
             temporary.unlink(missing_ok=True)
+            metadata_path(temporary).unlink(missing_ok=True)
         raise
 
     for pdf in files_to_old:
@@ -280,7 +287,7 @@ def resolve_manual(workspace: EvaluationWorkspace) -> ExitCode:
         old_name = pdf.with_name(f"{label}_old.pdf")
         if pdf != old_name:
             old_name.unlink(missing_ok=True)
-            shutil.move(str(pdf), str(old_name))
+            move_answer_pdf(pdf, old_name)
         set_suffix_and_clean_error(results, copy_id, label, "_old")
 
     for instruction in instructions:
@@ -298,7 +305,7 @@ def resolve_manual(workspace: EvaluationWorkspace) -> ExitCode:
             continue
         final_name = workspace.copies_dir / f"Copie{copy_id}" / f"{label}_new.pdf"
         final_name.unlink(missing_ok=True)
-        shutil.move(str(current_path), str(final_name))
+        move_answer_pdf(current_path, final_name)
         retained_origins = [origin for origin in origins[(copy_id, label)]
                             if (copy_id, origin) not in initial_paths
                             or initial_paths[(copy_id, origin)] not in files_to_old]
@@ -312,6 +319,7 @@ def resolve_manual(workspace: EvaluationWorkspace) -> ExitCode:
     for temporary in temp_files:
         if temporary not in used_temps:
             temporary.unlink(missing_ok=True)
+            metadata_path(temporary).unlink(missing_ok=True)
 
     for copy_id, label, target in dismissed_conflicts:
         # A removed instruction acknowledges the conflict without touching PDFs.

copienator/commands/splitting_int.py

@@ -22,6 +22,7 @@ from copienator import (
     workspace_from_target,
 )
 from copienator.filesystem import staged_directory
+from copienator.annotation_layout import fingerprint, metadata_path, save_parts
 
 SQUARE = 1000 // 38
 ANSWER_TOP_PADDING_POINTS = 4 * 72 / 25.4
@@ -129,6 +130,11 @@ def _render_split_outputs(
         visible_bounds = _prepare_split_pages(document)
         parsed = _parse_coordinates(coords_list)
         parts_by_label: defaultdict[str, list[Path]] = defaultdict(list)
+        provenance: defaultdict[str, list[dict]] = defaultdict(list)
+        schema = read_json(input_pdf.parent.parent / 'Cutleft' / f'{input_pdf.stem}_schema.json', default={})
+        analysis = schema.get('auto_margin') or {}
+        measurements = ({item['page']: item for item in analysis.get('pages', [])}
+                        if schema.get('source_sha256') == fingerprint(input_pdf) else {})
         with tempfile.TemporaryDirectory(prefix="copienator-split-") as temp_directory:
             temporary = Path(temp_directory)
             for index, item in enumerate(parsed):
@@ -200,6 +206,15 @@ def _render_split_outputs(
                         part_path,
                     )
                     parts_by_label[clean_label].append(part_path)
+                    edge = measurements.get(page_number + 1, {}).get('edge_mm')
+                    remaining = None if edge is None else max(0, edge - clip.x0 * 25.4 / 72)
+                    provenance[clean_label].append({
+                        'source': input_pdf.name, 'source_sha256': schema.get('source_sha256'),
+                        'page': page_number + 1, 'crop_points': list(clip),
+                        'margin_mm': remaining,
+                        'margin_status': ('unknown' if remaining is None else
+                                          'low' if remaining < 20 else 'normal'),
+                    })
 
             generated: set[str] = set()
             for label, parts in parts_by_label.items():
@@ -212,6 +227,8 @@ def _render_split_outputs(
                 finally:
                     merger.close()
                 generated.add(filename)
+                save_parts(staging / filename, provenance[label])
+                generated.add(metadata_path(staging / filename).name)
             return generated
     finally:
         document.close()

copienator/configuration.py

@@ -37,6 +37,8 @@ THINKING_LEVEL_FOR_LABEL = "medium"
 THINKING_LEVEL_FLASH = "medium"
 THINKING_LEVEL_PRO = "high"
 ALWAYS_CROP = False
+ANNOTATION_MARGIN_LEFT = 300
+ANNOTATION_LOW_MARGIN_LEFT = 400
 SHOW_PERSONAL_STEPS = False
 RETURN_JPEG_ENABLED = True
 RETURN_PDF_ENABLED = True

copienator/left_margin.py

@@ -144,7 +144,15 @@ def analyse_margins(images: list[Image.Image], render_dpi: int, reference_width:
             starts[run_start:] = [0] * (len(images) - run_start)
             break
 
-    return {'version': 5, 'starts_px': starts, 'groups': groups,
+    pages = []
+    for index in range(len(images)):
+        estimate = page_estimate(index)
+        edge = estimate['edge_mm']
+        pages.append({'page': index + 1, **estimate,
+                      'status': 'unknown' if edge is None else
+                      ('low' if edge < MIN_MARGIN_MM else 'normal')})
+
+    return {'version': 6, 'pages': pages, 'starts_px': starts, 'groups': groups,
             'no_margin_from_page': no_margin_from_page,
             'discard_left_fraction': DISCARD_LEFT_FRACTION, 'cut_fraction_of_margin': .5,
             'standard_margin_mm': STANDARD_MARGIN_MM, 'minimum_margin_mm': MIN_MARGIN_MM,

copienator/pdf_cut.py

@@ -6,6 +6,7 @@ from pathlib import Path
 import pymupdf
 
 from copienator.commands.splitting_int import _prepare_split_pages
+from copienator.annotation_layout import page_parts, save_parts
 
 # Percentages emitted by the GUI have six decimal places. Recover exact page
 # boundaries despite rounding, without turning nearby in-page cuts into breaks.
@@ -35,6 +36,7 @@ def cut_position(heights: list[float], percent: float) -> tuple[int, float]:
 
 def split_pdf(source: Path, percent: float, first_path: Path, second_path: Path) -> None:
     """Preserve whole pages; clip only the page actually crossed by the cut."""
+    parts = page_parts(source)
     with pymupdf.open(source) as document, pymupdf.open() as first, pymupdf.open() as second:
         index, offset = cut_position([page.rect.height for page in document], percent)
         if index:
@@ -55,3 +57,11 @@ def split_pdf(source: Path, percent: float, first_path: Path, second_path: Path)
                 second.insert_pdf(document, from_page=index + 1)
         first.save(first_path)
         second.save(second_path)
+        first_parts = [dict(part) for part in parts[:index + bool(offset)]]
+        second_parts = [dict(part) for part in parts[index:]]
+        if offset and 'crop_points' in parts[index]:
+            x0, y0, x1, y1 = parts[index]['crop_points']
+            first_parts[-1]['crop_points'] = [x0, y0, x1, y0 + offset]
+            second_parts[0]['crop_points'] = [x0, y0 + offset, x1, y1]
+        save_parts(first_path, first_parts)
+        save_parts(second_path, second_parts)

copienator/return_answers.py

@@ -84,7 +84,7 @@ def publish_answer_returns(
         raise ValueError(f"Expected a real answer directory: {answers_dir}")
     if configuration.RETURN_ANSWERS_ENABLED:
         options = load_return_answer_options(root)
-        labels = [label for label, entry in info.items() if entry["present"] and entry["not_empty"]]
+        labels = [label for label, entry in info.items() if entry["present"]]
 
         # Import the rendering backend only when individual images are requested.
         from copienator.commands.annotating import make_base_image

default_config.py

@@ -6,6 +6,10 @@ API_KEY = os.environ.get("GEMINI_API_KEY")
 EXPORT_DIR = Path("Export")
 IMPORT_DIR = Path("Import")
 
+# Espace ajouté à gauche des réponses annotées, en pixels à 200 dpi.
+ANNOTATION_MARGIN_LEFT = 300
+ANNOTATION_LOW_MARGIN_LEFT = 400
+
 # Fichiers à inclure dans A Rendre (les sources d'annotations sont conservées).
 RETURN_JPEG_ENABLED = True
 RETURN_PDF_ENABLED = True

docs/final_output.md

@@ -4,6 +4,40 @@ This documents the current implementation, as of 2026-09-12. The return folder
 referred to as « À rendre » is named **`A Rendre`** on disk. JPEG files use the
 extension **`.jpg`**, not `.jpeg`.
 
+## Left space for Gemini comments
+
+`config.py` (or the file selected by `COPIENATOR_CONFIG`) can override:
+
+```python
+ANNOTATION_MARGIN_LEFT = 300
+ANNOTATION_LOW_MARGIN_LEFT = 400
+```
+
+These are added pixels at the 200 dpi annotation rendering scale. An answer
+uses the larger margin if any of its source fragments has a measured left
+margin below 20 mm (half the standard 40 mm). Unknown or insufficiently written
+pages retain the normal spacing. The 600 px comment width is unchanged, so
+comments can still overlap handwriting on pages with very little whitespace.
+
+Automatic `crop-labels` saves per-page measurements in the Cutleft schema.
+`split-answers` records source pages, crop rectangles and remaining margins in
+`*.layout.json` files beside answer PDFs. Those files follow copies, manual
+merges and vertical cuts. PDF fingerprints prevent using stale measurements
+after files are replaced. Legacy schemas and manual/full-page Cutleft runs
+without measurements keep the normal spacing.
+
+For an existing evaluation, rerun automatic `crop-labels`, `split-answers`, and
+annotation generation with overwrite to populate and use this metadata. Do
+this before handwritten review: existing Bnot/BGnot/BRnot annotation batches
+save their rendering geometry and reuse it when read back, even after settings
+change. Older batches without saved geometry keep their original 300 px offset.
+Do not overwrite a batch that still contains handwritten corrections to import.
+
+All fragments of one answer share one left offset. BGnot pads narrower answer
+images with white without resizing handwriting; fitting the wider document to
+screen or paper may reduce the displayed scale, and return-PDF page breaks can
+change. The extra space is also used by Anot and Bnot.
+
 ## Files and their sources
 
 After grouped correction and review:
@@ -39,7 +73,7 @@ answer JPEGs.
 | `Student Name.pdf` | `Concat_F.pdf` | Filtered, paginated correction with context, questions and solutions. |
 | `score.json` | `score.json` | Per-question scores, including questions omitted from the filtered PDF. |
 | `info.json` | `info.json` | Answer presence, empty-answer classification, PDF membership and score. |
-| `answers/*.jpg` | Final per-label JPEGs selected by `info.json` | One annotated non-empty answer, with optional supplementary material. |
+| `answers/*.jpg` | Final per-label JPEGs selected by `info.json` | One annotated answer, including empty scans, with optional supplementary material. |
 
 ## Enabling or disabling outputs
 
@@ -69,9 +103,9 @@ and preserves return PDFs when present.
 ## Individual answer JPEGs
 
 With `RETURN_ANSWERS_ENABLED = True`, `giving-names` generates an `answers/`
-subdirectory inside each student's return folder. It includes **every non-empty
-compiled answer**, even a perfect answer omitted from the filtered PDF. Labels
-marked `empty-answer` and labels without an answer are excluded. Every JPEG
+subdirectory inside each student's return folder. It includes **every present
+compiled answer**, even a perfect answer omitted from the filtered PDF. Scans
+marked `empty-answer` are included; labels without an answer are excluded. Every JPEG
 contains the final annotated student answer, including retained feedback and
 extracted handwriting.
 
@@ -92,7 +126,7 @@ Filenames use natural label order, a three-digit minimum sequence number, and a
 sanitized label (`001 - Ex 1.jpg`). Numbering prevents filename collisions when
 labels differ only by characters forbidden in filenames. JSON keys retain exact
 labels. The managed `answers/` directory is replaced on successful generation,
-so removed/empty answers do not leave stale images; failures preserve the previous
+so removed answers do not leave stale images; failures preserve the previous
 directory. Disabling the option clears this directory on the next `giving-names`
 run. Separate storage keeps these images out of the personal final-mark stamping
 step, which reads only JPEGs directly inside the student's folder.
@@ -116,11 +150,13 @@ Every label in `score.json` has an object containing exactly four fields:
 ```
 
 - `present`: an answer entry exists for this student and label in the compilation
-  data. A supplied answer judged empty still has `present: true`.
+  data. A supplied answer judged empty still has `present: true`. A body removed by
+  manual annotation edits has `present: false`.
 - `not_empty`: the answer was not marked `empty-answer` and was successfully
   compiled. Absent answers have `not_empty: false`. When individual export is
-  enabled, a JPEG is generated if and only if both `present` and `not_empty` are
-  true. These fields describe the answer regardless of export settings.
+  enabled, every `present` answer gets a JPEG, including those with `not_empty: false`.
+  Image retention alone does not change the empty classification. These fields
+  describe the answer regardless of export settings.
 - `touched`: the answer appears in the compiled filtered `Concat_F.pdf`, using
   the actual selection including handwriting and selective redo preservation.
   It is not a flag for human edits. Empty and absent answers have `false`.
@@ -151,7 +187,8 @@ The result is one RGB image of variable height, with no page breaks. It contains
 all successfully compiled answer blocks, including answers scored 4 with no
 remaining feedback. “Full” refers to those answer blocks, not the original scan
 pages or every question in the statement. Missing/unrenderable answers cannot
-be included, and the renderer normally suppresses `empty-answer` results.
+be included. Empty-answer scans are retained individually but excluded from
+the combined and filtered documents.
 The grouped compiler refuses to publish a new set when compilation is incomplete.
 
 The JPEG does not prepend the question, context or model solution PDFs.

tests/test_annotation_layout.py

@@ -0,0 +1,139 @@
+import tempfile
+import unittest
+from pathlib import Path
+from unittest.mock import Mock, patch
+
+import pymupdf
+from PIL import Image
+
+from copienator import atomic_write_json, configuration, read_json
+from copienator.annotation_layout import (
+    answer_parts, copy_answer_pdf, fingerprint, layout_for, legacy_layout,
+    move_answer_pdf, save_parts,
+)
+from copienator.commands import annotating, annotating_by_label, splitting_int
+from copienator.commands import reading_grouped_annotations as reader
+from copienator.left_margin import analyse_margins
+from copienator.pdf_cut import split_pdf
+
+
+class AnnotationLayoutTests(unittest.TestCase):
+    def setUp(self):
+        self.temp = tempfile.TemporaryDirectory()
+        self.addCleanup(self.temp.cleanup)
+        self.root = Path(self.temp.name)
+        self.pdf = self.root / 'Copies' / 'Copie01.pdf'
+        self.pdf.parent.mkdir()
+        with pymupdf.open() as document:
+            for _ in range(2):
+                page = document.new_page(width=600, height=800)
+                page.insert_text((100, 100), 'Answer')
+            document.save(self.pdf)
+
+    def test_all_pages_measured_after_early_no_margin_run(self):
+        images = [Image.new('RGB', (600, 100)) for _ in range(6)]
+        values = [10, 10, 40, None, 19.9, 20]
+        estimates = {id(image): value for image, value in zip(images, values)}
+        def estimate(image, dpi):
+            edge = estimates[id(image)]
+            return {'edge_mm': edge, 'bands': 0 if edge is None else 8,
+                    'band_starts_mm': [] if edge is None else [edge] * 8}
+        with patch('copienator.left_margin.estimate_page', side_effect=estimate):
+            result = analyse_margins(images, 200, 600)
+        self.assertEqual([p['status'] for p in result['pages']],
+                         ['low', 'low', 'normal', 'unknown', 'low', 'normal'])
+
+    def test_split_records_pages_and_rejects_stale_measurements(self):
+        schema_path = self.root / 'Cutleft' / 'Copie01_schema.json'
+        atomic_write_json(schema_path, {
+            'source_sha256': fingerprint(self.pdf),
+            'auto_margin': {'pages': [{'page': 1, 'edge_mm': 40}, {'page': 2, 'edge_mm': 10}]},
+        })
+        staging = self.root / 'split'
+        staging.mkdir()
+        splitting_int._render_split_outputs(self.pdf, [('Ex 1', 0, 0, 10, 0, 10)], staging)
+        answer = staging / 'Ex 1.pdf'
+        self.assertEqual([p['page'] for p in answer_parts(answer)], [1, 2])
+        self.assertEqual(layout_for(answer)['margin_left'], 400)
+        atomic_write_json(schema_path, {'source_sha256': 'stale', 'auto_margin': {
+            'pages': [{'page': 1, 'edge_mm': 10}]}})
+        splitting_int._render_split_outputs(self.pdf, [('Ex 1', 0, 0, 10, 0, 10)], staging)
+        self.assertEqual(layout_for(answer)['margin_left'], 300)
+
+    def test_configurable_margin_unknown_fallback_and_stale_sidecar(self):
+        self.assertEqual(layout_for(self.pdf)['margin_left'], 300)
+        save_parts(self.pdf, [{'margin_status': 'normal'}, {'margin_status': 'low'}])
+        with patch.object(configuration, 'ANNOTATION_LOW_MARGIN_LEFT', 450):
+            self.assertEqual(layout_for(self.pdf)['margin_left'], 450)
+        self.pdf.write_bytes(self.pdf.read_bytes() + b'\n')
+        self.assertEqual(layout_for(self.pdf)['margin_left'], 300)
+
+    def test_horizontal_answer_crop_can_remove_an_original_margin(self):
+        atomic_write_json(self.root / 'Cutleft' / 'Copie01_schema.json', {
+            'source_sha256': fingerprint(self.pdf),
+            'auto_margin': {'pages': [{'page': 1, 'edge_mm': 40}, {'page': 2, 'edge_mm': 40}]},
+        })
+        staging = self.root / 'horizontal'
+        staging.mkdir()
+        # 20% of a 600-point page removes 42.3 mm from the left.
+        splitting_int._render_split_outputs(self.pdf, [('|Ex 1', 0, 0, 10, 100, 110)], staging)
+        answer = staging / 'Ex 1.pdf'
+        self.assertEqual(layout_for(answer)['margin_left'], 400)
+        self.assertEqual(answer_parts(answer)[0]['margin_mm'], 0)
+
+    def test_copy_move_and_vertical_cut_preserve_page_classification(self):
+        save_parts(self.pdf, [{'margin_status': 'normal'}, {'margin_status': 'low'}])
+        copied = self.root / 'copied.pdf'
+        moved = self.root / 'moved.pdf'
+        copy_answer_pdf(self.pdf, copied)
+        move_answer_pdf(copied, moved)
+        self.assertEqual(layout_for(moved)['margin_left'], 400)
+        first, second = self.root / 'first.pdf', self.root / 'second.pdf'
+        split_pdf(moved, 50, first, second)
+        self.assertEqual(layout_for(first)['margin_left'], 300)
+        self.assertEqual(layout_for(second)['margin_left'], 400)
+
+    def render(self, layout):
+        callback = Mock()
+        result = {'score': 2, 'feedback': [{'text': 'Feedback', 'box_2d': [10, 50, 30, 100]}]}
+        with patch.object(annotating, 'render_score_text', return_value=Image.new('RGBA', (200, 40))):
+            image, header = annotating.compose_label_image(
+                Image.new('RGB', (1654, 100), 'blue'), 'Ex 1', result, 0,
+                render_fn=lambda *args, **kwargs: Image.new('RGBA', (200, 10)),
+                draw_callback=callback, layout=layout)
+        box = next(call.args[2]['box'] for call in callback.call_args_list if call.args[0] == 'local_rect')
+        return image, header, box
+
+    def test_wider_layout_translates_copy_and_feedback_without_scaling(self):
+        normal, height, box = self.render(legacy_layout())
+        low, low_height, low_box = self.render({**legacy_layout(), 'margin_left': 400})
+        self.assertEqual(low.width, normal.width + 100)
+        self.assertEqual(height, low_height)
+        self.assertEqual(low_box, [box[0] + 100, box[1], box[2] + 100, box[3]])
+        self.assertEqual(low.getpixel((400, height + 80)), (0, 0, 255))
+        self.assertEqual(low.getpixel((399, height + 80)), (255, 255, 255))
+
+    def test_mixed_bgnot_widths_and_saved_geometry_survive_config_change(self):
+        normal, height, _ = self.render(legacy_layout())
+        low, _, _ = self.render({**legacy_layout(), 'margin_left': 400})
+        annotating_by_label.save_batch([
+            ('01', 'Ex 1', normal, height, []), ('02', 'Ex 1', low, height, []),
+        ], 'Ex 1', 1, self.root)
+        output = self.root / 'Ex 1 G1'
+        meta = read_json(output / 'bnote.json')
+        self.assertEqual(meta['width'], low.width)
+        with Image.open(output / 'Reference.jpg') as reference:
+            self.assertGreater(min(reference.getpixel((low.width - 10, 80))), 245)
+        with patch.object(reader, 'detect_checks_and_notes', return_value=([], Image.new('RGBA', (low.width, low.height * 2)))), patch.object(configuration, 'ANNOTATION_LOW_MARGIN_LEFT', 500):
+            _, notes = reader._scan_annotation_directory(output)
+        self.assertEqual(notes['02']['Ex 1']['layout']['margin_left'], 400)
+        rerender, _, _ = self.render(notes['02']['Ex 1']['layout'])
+        self.assertEqual(rerender.width, low.width)
+        with patch.object(reader, 'detect_checks_and_notes', return_value=([], None)):
+            _, notes = reader._scan_annotation_directory(output)
+        self.assertEqual(notes['02']['Ex 1']['layout']['margin_left'], 400)
+        self.assertIsNone(notes['02']['Ex 1']['img'])
+
+
+if __name__ == '__main__':
+    unittest.main()

tests/test_annotation_modifications.py

@@ -115,6 +115,29 @@ class ModificationTests(unittest.TestCase):
         self.assertFalse((self.output / "Empty.jpg").exists())
         self.assertFalse(read_json(self.output / "info.json")["Empty"]["not_empty"])
 
+    def test_retained_empty_scan_stays_empty_after_unrelated_edits_and_can_be_replaced(self):
+        self.images["Empty"] = Image.new("RGB", (100, 60), "white")
+        self.heights["Empty"] = 10
+        self.info["Empty"]["present"] = True
+        self.seed()
+        self.apply("Copie43 Ex 1 -> Ex 2|")
+        info = read_json(self.output / "info.json")
+        self.assertTrue((self.output / "Empty.jpg").is_file())
+        self.assertEqual(info["Empty"], self.info["Empty"])
+        with Image.open(self.output / "Concat.jpg") as image:
+            self.assertEqual(image.height, 120 + 180 + 40)
+        self.apply("Copie43 Ex 1 -> Empty")
+        self.assertTrue(read_json(self.output / "info.json")["Empty"]["not_empty"])
+        self.apply()
+        self.assertEqual(read_json(self.output / "info.json")["Empty"], self.info["Empty"])
+
+    def test_removed_body_is_absent_and_not_exported_as_an_empty_scan(self):
+        self.apply("Copie43 Ex 1 x> Ex 2")
+        info = read_json(self.output / "info.json")["Ex 1"]
+        self.assertFalse(info["present"])
+        self.assertFalse(info["not_empty"])
+        self.assertFalse((self.output / "Ex 1.jpg").exists())
+
     def test_invalid_file_does_not_apply_valid_first_instruction(self):
         before = {p.name: p.read_bytes() for p in self.output.iterdir() if p.is_file()}
         with self.assertRaises(CliError):

tests/test_answer_returns.py

@@ -57,8 +57,8 @@ class AnswerReturnTests(unittest.TestCase):
             ), patch.object(annotating, "make_base_image", side_effect=self.supplement):
                 publish_answer_returns(self.root, self.source, self.destination)
                 files = sorted((self.destination / "answers").glob("*.jpg"))
-                self.assertEqual([p.name for p in files], ["Ex 1.jpg", "Ex 2.jpg"])
-                with Image.open(files[0]) as image:
+                self.assertEqual([p.name for p in files], ["Empty.jpg", "Ex 1.jpg", "Ex 2.jpg"])
+                with Image.open(self.destination / "answers" / "Ex 1.jpg") as image:
                     self.assertEqual(image.size, (100, 30 + 20 * sum((context, question, solution))))
                     colors = []
                     if context:
@@ -212,7 +212,7 @@ class AnswerReturnTests(unittest.TestCase):
         )
         self.assertEqual(
             sorted(path.name for path in answers.iterdir()),
-            ["Ex 1.jpg", "Ex 2.jpg"],
+            ["Empty.jpg", "Ex 1.jpg", "Ex 2.jpg"],
         )
 
 
@@ -304,7 +304,7 @@ class CompiledMembershipTests(unittest.TestCase):
                 self.assertEqual(info["Empty"], {"present": True, "not_empty": False, "touched": False, "score": "0"})
                 self.assertEqual(info["Absent"], {"present": False, "not_empty": False, "touched": False, "score": ""})
                 self.assertEqual(info["Perfect"], {"present": True, "not_empty": True, "touched": False, "score": "4"})
-                self.assertNotIn("Empty", rendered)
+                self.assertIn("Empty", rendered)
                 for label in rendered:
                     self.assertTrue((output / f"{label}.jpg").is_file())
                 # Selective redo keeps unselected saved answers in the PDF,
@@ -316,6 +316,76 @@ class CompiledMembershipTests(unittest.TestCase):
                 self.assertTrue(read_json(output / "info.json")["Perfect"]["touched"])
                 self.assertFalse(read_json(output / "info.json")["Empty"]["not_empty"])
 
+    def test_real_empty_pdf_is_published_in_all_annotation_modes(self):
+        import fitz
+        from copienator.commands import reading_annotations as standard
+        for mode in ("Anot", "Bnot", "BGnot"):
+            with self.subTest(mode=mode), tempfile.TemporaryDirectory() as directory:
+                root = Path(directory)
+                workspace = EvaluationWorkspace(root)
+                (root / "labels").write_text("Empty\nAbsent\n")
+                pdf = root / "answer.pdf"
+                with fitz.open() as document:
+                    page = document.new_page(width=200, height=60)
+                    page.insert_text((10, 30), "Copied question only")
+                    document.save(pdf)
+                data = {"01": {"Empty": {"pdf_path": pdf, "coordinates": (0, 0),
+                    "result": {"score": 0, "error": "empty-answer", "feedback": []}}}}
+                if mode == "Anot":
+                    status = annotating.process_student("01", data["01"], root, ["Empty", "Absent"], True)
+                    self.assertEqual(status, "success")
+                elif mode == "Bnot":
+                    status = standard.apply_actions_and_regenerate(
+                        workspace, data, "01", [], None, ["Empty", "Absent"])
+                    self.assertEqual(status, 0)
+                else:
+                    status, _ = reader.apply_actions_and_regenerate_grouped(
+                        workspace, data, "01", [], {}, ["Empty", "Absent"])
+                    self.assertEqual(status, 0)
+                output = root / mode / "Copie01"
+                destination = root / "return"
+                destination.mkdir()
+                with patch.multiple(configuration, RETURN_ANSWERS_ENABLED=True,
+                                    RETURN_ANSWERS_CONTEXT=False, RETURN_ANSWERS_QUESTION=False,
+                                    RETURN_ANSWERS_SOLUTION=False):
+                    publish_answer_returns(root, output, destination)
+                self.assertEqual([p.name for p in (destination / "answers").iterdir()], ["Empty.jpg"])
+                with Image.open(destination / "answers" / "Empty.jpg") as image:
+                    self.assertGreater(image.height, 0)
+                    self.assertLess(image.convert("L").getextrema()[0], 100)
+                self.assertFalse(read_json(destination / "info.json")["Empty"]["not_empty"])
+                self.assertFalse((output / "Concat.jpg").exists())
+                self.assertFalse((output / "Concat_F.pdf").exists())
+
+    def test_bnot_recovers_empty_scans_missing_from_review_layout(self):
+        from copienator.commands import reading_annotations as standard
+        for only_empty in (False, True):
+            with self.subTest(only_empty=only_empty), tempfile.TemporaryDirectory() as directory:
+                workspace = EvaluationWorkspace(Path(directory))
+                output = workspace.root / "Bnot" / "Copie01"
+                output.mkdir(parents=True)
+                answer = workspace.root / "answer.pdf"
+                answer.touch()
+                labels = {"Empty": {"pdf_path": answer, "coordinates": (0, 0),
+                                    "result": {"score": 0, "error": "empty-answer"}}}
+                if not only_empty:
+                    labels["Full"] = {"pdf_path": answer, "coordinates": (0, 0),
+                                      "result": {"score": 4}}
+                    atomic_write_json(output / "bnote.json", {"images": [
+                        {"label": "Full", "hmin": 0, "hmax": 50, "header_height": 0}]})
+                with patch.object(annotating, "make_base_image", return_value=(None, 0, 0)), patch.object(
+                    annotating, "compose_label_image", return_value=(Image.new("RGB", (100, 50)), 0)
+                ) as render:
+                    status = standard.apply_actions_and_regenerate(
+                        workspace, {"01": labels}, "01", [], None, [*labels, "Absent"])
+                self.assertEqual(status, 0)
+                self.assertTrue(all(call.kwargs["with_empty"] for call in render.call_args_list))
+                self.assertTrue((output / "Empty.jpg").is_file())
+                self.assertFalse((output / "Absent.jpg").exists())
+                self.assertFalse(read_json(output / "info.json")["Empty"]["not_empty"])
+                self.assertEqual((output / "Concat.jpg").exists(), not only_empty)
+                self.assertFalse((output / "Concat_F.jpg").exists())
+
     def test_all_empty_removes_stale_concat_and_records_false(self):
         with tempfile.TemporaryDirectory() as directory:
             workspace = EvaluationWorkspace(Path(directory))
@@ -325,10 +395,17 @@ class CompiledMembershipTests(unittest.TestCase):
                 (output / name).write_bytes(b"stale")
             atomic_write_json(output / "touched.json", {"Empty": True})
             atomic_write_json(output / "answer_labels.json", ["Empty"])
+            answer = workspace.root / "answer.pdf"
+            answer.touch()
+            with patch.object(annotating, "make_base_image", return_value=(Image.new("RGB", (100, 50)), 0, 0)), patch.object(
+                annotating, "compose_label_image", return_value=(Image.new("RGB", (100, 50)), 0)
+            ):
                 status, _ = reader.apply_actions_and_regenerate_grouped(
-                workspace, {"01": {"Empty": {"result": {"score": 0, "error": "empty-answer"}}}},
+                    workspace, {"01": {"Empty": {"result": {"score": 0, "error": "empty-answer"},
+                        "pdf_path": answer, "coordinates": (0, 0)}}},
                     "01", [], {}, ["Empty"]
                 )
+            self.assertTrue((output / "Empty.jpg").is_file())
             self.assertEqual(status, 0)
             self.assertEqual(read_json(output / "info.json"), {
                 "Empty": {"present": True, "not_empty": False, "touched": False, "score": "0"}

tests/test_manual_resolution_state.py

@@ -9,11 +9,29 @@ import pymupdf
 from copienator import CliError, EvaluationWorkspace, atomic_write_json, read_json
 from copienator.commands import correction, resolve_manual
 from copienator.answer_origins import origins_for, save_origins
+from copienator.annotation_layout import save_parts, answer_parts, layout_for, page_parts
 from copienator.annotation_data import load_annotation_data
 from copienator_gui.app import has_manual_conflicts
 
 
 class ManualResolutionStateTests(unittest.TestCase):
+    def test_merge_preserves_low_margin_and_page_order(self):
+        for pipe_first in (False, True):
+            with self.subTest(pipe_first=pipe_first), tempfile.TemporaryDirectory() as temporary:
+                workspace = self.fixture(Path(temporary), '->')
+                workspace.manual_resolutions_file.write_text(
+                    'Copie01 A -> |B\n' if pipe_first else 'Copie01 A -> B|\n')
+                copies = workspace.copies_dir / 'Copie01'
+                for label, status in (('A', 'low'), ('B', 'normal')):
+                    pdf = copies / f'{label}.pdf'
+                    save_parts(pdf, [{'margin_status': status} for _ in page_parts(pdf)])
+                resolve_manual.resolve_manual(workspace)
+                target = resolve_manual.get_actual_pdf(workspace.copies_dir, '01', 'B')
+                self.assertEqual(layout_for(target)['margin_left'], 400)
+                statuses = [part['margin_status'] for part in answer_parts(target)]
+                self.assertEqual(statuses[0], 'low' if pipe_first else 'normal')
+                self.assertEqual(statuses[-1], 'normal' if pipe_first else 'low')
+
     def test_automatic_additional_content_records_origin_but_wrong_label_does_not(self):
         for kind in ("additional-answer", "wrong-label"):
             with self.subTest(kind=kind), tempfile.TemporaryDirectory() as temporary: