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/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):
@@ -544,7 +547,7 @@ 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))

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,
@@ -224,6 +225,8 @@ def apply_actions_and_regenerate(
             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

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:
@@ -181,12 +181,13 @@ 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):
-                notes_by_student[student_id][label] = {
-                    "img": crop,
-                    "old_header_h": int(image_info.get("header_height", 0)),
-                }
+            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 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)
 
 
@@ -346,6 +347,8 @@ def apply_actions_and_regenerate_grouped(
             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

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)

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:

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_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: