better faulty encoding detection

copienator/commands/correction.py

@@ -21,6 +21,7 @@ from copienator.commands import grouping
 from copienator.answer_origins import save_origins
 from copienator import prompting
 from copienator.feedback_boxes import valid_feedback_box
+from copienator.latex_json import repair_latex_json
 from copienator import (
     CliError,
     EvaluationWorkspace,
@@ -100,6 +101,16 @@ def report_group_progress(completed: int, total: int) -> None:
     )
 
 
+def parse_correction_response(response_text: str):
+    """Decode model JSON without consuming known LaTeX command prefixes."""
+    return json.loads(
+        repair_latex_json(
+            response_text,
+            additional_content_fields={"text"},
+        )
+    )
+
+
 def request_graceful_stop(_signum=None, _frame=None) -> None:
     """Stop scheduling Gemini calls while allowing in-flight calls to finish."""
     if not stop_requested.is_set():
@@ -319,7 +330,7 @@ def correct_boxes_with_gemini(pid, label, pdf_path, original_feedbacks,
 
     contents, config = prompting.request_for_box_correction(pdf_path, original_feedbacks)
     response_text = call_gemini_with_retries(MODEL_ID_flash, contents, config)
-    corrected_feedbacks = json.loads(response_text)
+    corrected_feedbacks = parse_correction_response(response_text)
 
     global_feedbacks = [f for f in original_feedbacks if not f["box_2d"]]
 
@@ -507,7 +518,7 @@ def process_single_task(task_tuple, precomputed_response=None):
                 tprint(f"Asking Gemini {'Flash' if use_flash else 'Pro  '}: {label} {group_name}")
                 full_response_text = call_gemini_with_retries(model_to_use, contents, config)
 
-            json_data = json.loads(full_response_text)
+            json_data = parse_correction_response(full_response_text)
 
             # Ensure consistency of answer placements
             for p in json_data:

copienator/commands/gemini_for_labels.py

@@ -554,11 +554,18 @@ def run(
         client = genai.Client(api_key=api_key)
 
     groups = group_images(images)
+    total_groups = len(groups)
     active: dict[str, tuple[str, float]] = {}
     progress_lock = Lock()
     incomplete: list[Path] = []
     run_started = time.monotonic()
 
+    def print_group_progress(completed: int) -> None:
+        print(
+            f"Label detection progress: {completed}/{total_groups} copy groups completed.",
+            flush=True,
+        )
+
     def report_progress(group: str, description: str, started: float) -> None:
         with progress_lock:
             active[group] = (description, started)
@@ -582,6 +589,7 @@ def run(
             for group_key, files in groups.items()
         }
         pending = set(futures)
+        print_group_progress(0)
         while pending:
             done, pending = wait(pending, timeout=PROGRESS_INTERVAL)
             for future in done:
@@ -591,6 +599,7 @@ def run(
                     future.result()
                 except IncompleteCopyError as exc:
                     incomplete.extend(exc.images)
+            print_group_progress(total_groups - len(pending))
             if pending:
                 now = time.monotonic()
                 with progress_lock:

copienator/commands/plotting.py

@@ -313,6 +313,7 @@ class ImageViewer:
         # Bindings
         self.root.bind(PLOTTING_KB["OK"], self.on_enter)
         self.root.bind(PLOTTING_KB["previous"], self.on_previous)
+        self.root.bind("P", self.on_previous)
         self.root.bind(PLOTTING_KB["edit"], self.on_edit)
         self.root.bind(PLOTTING_KB["open pdf"], self.on_open_pdf)
         self.root.bind(PLOTTING_KB["open original pdf"], self.on_open_ori_pdf)

copienator/commands/post_correction.py

@@ -16,6 +16,7 @@ from copienator import (
     read_json,
     workspace_from_args,
 )
+from copienator.latex_json import repair_decoded_latex_controls
 
 WORD_LIST_FILE = Path(__file__).resolve().parents[1] / "data" / "liste_francais.txt"
 ACCENT_PATTERN = re.compile(r"[éèêëàâäîïôöùûüçœÉÈÊËÀÂÄÎÏÔÖÙÛÜÇŒ]")
@@ -89,6 +90,7 @@ def fix_hex_corruption_safe(text: str) -> str:
 
 def repair_json_escape_corruption(text: str) -> str:
     r"""Restore observed LaTeX commands consumed as JSON control escapes."""
+    text = repair_decoded_latex_controls(text)
     replacements = (
         ("\x0crac", r"\frac"),
         ("\x0ceuille", r"\equiv"),
@@ -132,6 +134,33 @@ def clean_obj(value: Any, lookup: dict[str, str]) -> Any:
     return value
 
 
+def unresolved_math_control_paths(value: Any, path: str = "$") -> list[str]:
+    """Locate destructive JSON control escapes left in mathematical text."""
+    if isinstance(value, str):
+        return (
+            [path]
+            if any(
+                control in {"\b", "\f"}
+                for match in MATH_PATTERN.finditer(value)
+                for control in match.group(0)
+            )
+            else []
+        )
+    if isinstance(value, list):
+        return [
+            issue
+            for index, item in enumerate(value)
+            for issue in unresolved_math_control_paths(item, f"{path}[{index}]")
+        ]
+    if isinstance(value, dict):
+        return [
+            issue
+            for key, item in value.items()
+            for issue in unresolved_math_control_paths(item, f"{path}[{key!r}]")
+        ]
+    return []
+
+
 def run(
     workspace: EvaluationWorkspace,
     *,
@@ -141,11 +170,18 @@ def run(
     lookup = build_lookup_map(word_list_path)
     data = read_json(workspace.correction_file)
     cleaned = clean_obj(data, lookup)
+    unresolved = unresolved_math_control_paths(cleaned)
     backup = workspace.root / "correction_precleanup.json"
     atomic_write_bytes(backup, workspace.correction_file.read_bytes())
     print(f"Original JSON backed up to {backup}")
     atomic_write_json(workspace.correction_file, cleaned)
     print(f"Fixed JSON saved to {workspace.correction_file}")
+    if unresolved:
+        print(
+            "Warning: unresolved JSON control characters remain in mathematical "
+            "text at: " + ", ".join(unresolved)
+        )
+        return ExitCode.PARTIAL
     return ExitCode.SUCCESS
 
 

copienator/latex_json.py

@@ -13,6 +13,9 @@ _CONTENT_FIELDS = {'question_content', 'solution_content', 'context_content', 'r
 _CONTENT_KEYS = {f'"{field}"' for field in _CONTENT_FIELDS}
 _STRING = re.compile(r'"(?:\\.|[^"\\])*"', re.DOTALL)
 _COMMAND = re.compile(r'[a-zA-Z]+')
+_MATH = re.compile(r"(\$\$.*?\$\$|\$.*?\$|\\\(.*?\\\)|\\\[.*?\\\])", re.DOTALL)
+_DECODED_COMMAND = re.compile(r"[\b\f\n\r\t]([A-Za-z]+)")
+_JSON_CONTROL_PREFIX = {"\b": "b", "\f": "f", "\n": "n", "\r": "r", "\t": "t"}
 
 
 def normalize_literal_newlines(text: str) -> str:
@@ -44,6 +47,29 @@ underbrace underline underset uparrow updownarrow upsilon usepackage
 '''.split())
 
 
+def repair_decoded_latex_controls(text: str) -> str:
+    r"""Restore known TeX commands after JSON decoded their first letter.
+
+    Only math spans and whitelisted command names are changed. This avoids
+    treating ordinary paragraph newlines or tabs as damaged LaTeX.
+    """
+    def repair_math(math_match: re.Match[str]) -> str:
+        def repair_command(command_match: re.Match[str]) -> str:
+            candidate = (
+                _JSON_CONTROL_PREFIX[command_match.group(0)[0]]
+                + command_match.group(1)
+            )
+            return (
+                f"\\{candidate}"
+                if candidate in _AMBIGUOUS_COMMANDS
+                else command_match.group(0)
+            )
+
+        return _DECODED_COMMAND.sub(repair_command, math_match.group(0))
+
+    return _MATH.sub(repair_math, text)
+
+
 def _repair_string(token: str) -> str:
     output = []
     index = 0
@@ -71,7 +97,9 @@ def _repair_string(token: str) -> str:
     return ''.join(output)
 
 
-def repair_latex_json(raw: str) -> str:
+def repair_latex_json(
+    raw: str, *, additional_content_fields: set[str] | None = None
+) -> str:
     """Repair single TeX backslashes without decoding or rewriting other JSON.
 
     Preserve standard escapes, Unicode escapes, and already escaped TeX.
@@ -79,14 +107,22 @@ def repair_latex_json(raw: str) -> str:
     as a broken ``\\not`` command; known TeX command names take precedence.
     Raw responses/caches should be retained to allow reviewing such cases.
     """
+    additional_content_keys = {
+        f'"{field}"' for field in (additional_content_fields or set())
+    }
     output = []
     end = 0
     previous = None
     for match in _STRING.finditer(raw):
         token = match.group()
-        if (previous is not None and raw[previous.end():match.start()].strip() == ':'
+        if previous is not None and raw[previous.end():match.start()].strip() == ':':
-                and previous.group() in _CONTENT_KEYS):
+            if previous.group() in _CONTENT_KEYS:
-            token = _repair_string(token)
+                token = _repair_string(token)
+            elif previous.group() in additional_content_keys:
+                token = _MATH.sub(
+                    lambda math_match: _repair_string(math_match.group(0)),
+                    token,
+                )
         output.extend((raw[end:match.start()], token))
         end = match.end()
         previous = match

copienator_gui/app.py

@@ -325,7 +325,7 @@ class CopienatorApp(tk.Tk):
 
         top = ttk.Frame(self, padding=(10, 8))
         top.grid(row=0, column=0, sticky="ew")
-        top.columnconfigure(5, weight=1)
+        top.columnconfigure(6, weight=1)
         ttk.Button(top, text="Charger", command=self._load_evaluation).grid(
             row=0, column=0, padx=(0, 8)
         )
@@ -333,14 +333,19 @@ class CopienatorApp(tk.Tk):
         self.evaluation_entry = ttk.Entry(top, textvariable=self.evaluation_var, width=42)
         self.evaluation_entry.grid(row=0, column=2, sticky="w")
         self.evaluation_entry.bind("<Return>", lambda _event: self._load_evaluation())
+        self.browse_evaluation_button = ttk.Button(
+            top, text="Parcourir…", command=self._browse_evaluation
+        )
+        self.browse_evaluation_button.grid(row=0, column=3, padx=(6, 0))
         self.open_evaluation_button = ttk.Button(
             top, text="Ouvrir le dossier", command=self._open_evaluation_folder
         )
-        self.open_evaluation_button.grid(row=0, column=3, padx=(6, 0))
+        self.open_evaluation_button.grid(row=0, column=4, padx=(12, 0))
-        ttk.Button(top, text="Parcourir…", command=self._browse_evaluation).grid(
+        self.open_statement_button = ttk.Button(
-            row=0, column=4, padx=6
+            top, text="Ouvrir l’énoncé", command=self._open_statement_pdf
         )
-        ttk.Button(top, text="Diagnostic…", command=self._show_diagnostics).grid(row=0, column=6, padx=(6, 0))
+        self.open_statement_button.grid(row=0, column=5, padx=(6, 0))
+        ttk.Button(top, text="Diagnostic…", command=self._show_diagnostics).grid(row=0, column=7, padx=(6, 0))
 
         ttk.Label(top, text="Clé Gemini").grid(row=1, column=0, sticky="w", padx=(0, 8), pady=(7, 0))
         ttk.Entry(top, textvariable=self.api_key_var, show="•", width=32).grid(
@@ -560,6 +565,11 @@ class CopienatorApp(tk.Tk):
     def _open_evaluation_folder(self) -> None:
         self._open_desktop_path(self.evaluation, "dossier d’évaluation")
 
+    def _open_statement_pdf(self) -> None:
+        evaluation = self.evaluation
+        statement = EvaluationWorkspace(evaluation).statement_pdf_file if evaluation else None
+        self._open_desktop_path(statement, "fichier enonce.pdf")
+
     def _toggle_proxy(self) -> None:
         self.proxy_entry.configure(state="normal" if self.use_proxy_var.get() else "disabled")
 

copienator_gui/syncthing.py

@@ -4,12 +4,13 @@ import subprocess
 import threading
 from tkinter import ttk, messagebox
 
-SERVICE = "syncthing@sebastien.service"
+SERVICE = "syncthing.service"
+SYSTEMCTL = ("systemctl", "--user", "--no-ask-password")
 
 
 def service_status():
     result = subprocess.run(
-        ["systemctl", "show", SERVICE, "--property=ActiveState", "--value"],
+        [*SYSTEMCTL, "show", SERVICE, "--property=ActiveState", "--value"],
         capture_output=True, text=True, timeout=10,
     )
     if result.returncode:
@@ -22,7 +23,7 @@ def control_service(action):
         return "active"
     command = "start" if action == "ensure" else action
     result = subprocess.run(
-        ["systemctl", "--no-ask-password", command, SERVICE],
+        [*SYSTEMCTL, command, SERVICE],
         capture_output=True, text=True, timeout=60,
     )
     if result.returncode:
@@ -87,13 +88,18 @@ class SyncthingPanel(ttk.Frame):
             self.start_button.configure(state="normal")
             self.stop_button.configure(state="normal")
             self.status.configure(text=f"{SERVICE} : {error or status}")
-            if error and action != "status":
+            if action == "ensure":
-                self.pending_export = None
-                messagebox.showerror("Syncthing", error)
-            elif action == "ensure":
                 callback, self.pending_export = self.pending_export, None
+                if error:
+                    messagebox.showwarning(
+                        "Syncthing",
+                        f"Impossible de démarrer Syncthing : {error}\n\n"
+                        "L’export va continuer.",
+                    )
                 if callback:
                     callback()
+            elif error and action != "status":
+                messagebox.showerror("Syncthing", error)
             elif self.pending_export:
                 self.request("ensure")
         if self.winfo_exists():

tests/test_gui_convenience.py

@@ -99,15 +99,29 @@ class GuiConvenienceTests(unittest.TestCase):
                 self.assertEqual(self.app.state_store.step("statement_persp")["status"], expected)
                 self.assertEqual(self.app.state_store.step("statement_groups")["status"], "ready")
 
-    def test_compact_evaluation_input_and_open_folder_button(self):
+    def test_evaluation_buttons_are_ordered_and_open_folder_and_statement(self):
         self.assertEqual(int(self.app.evaluation_entry.cget("width")), 42)
         self.assertEqual(
-            int(self.app.open_evaluation_button.grid_info()["column"]),
+            int(self.app.browse_evaluation_button.grid_info()["column"]),
             int(self.app.evaluation_entry.grid_info()["column"]) + 1,
         )
+        self.assertEqual(
+            int(self.app.open_evaluation_button.grid_info()["column"]),
+            int(self.app.browse_evaluation_button.grid_info()["column"]) + 1,
+        )
+        self.assertEqual(
+            int(self.app.open_statement_button.grid_info()["column"]),
+            int(self.app.open_evaluation_button.grid_info()["column"]) + 1,
+        )
+        statement = self.evaluation / "enonce.pdf"
+        statement.touch()
         with patch("copienator_gui.app.open_path") as opened:
             self.app.open_evaluation_button.invoke()
-        opened.assert_called_once_with(self.evaluation)
+            self.app.open_statement_button.invoke()
+        self.assertEqual(
+            opened.call_args_list,
+            [unittest.mock.call(self.evaluation), unittest.mock.call(statement)],
+        )
 
     def test_manual_resolution_panel_follows_command_target(self):
         manual = self.evaluation / "manual_resolutions.txt"

tests/test_gui_core.py

@@ -21,6 +21,7 @@ from pypdf import PdfReader, PdfWriter
 from copienator import (
     CliError,
     EvaluationWorkspace,
+    ExitCode,
     WorkspaceNotFoundError,
     WorkspaceValidationError,
     atomic_update_json,
@@ -1058,6 +1059,26 @@ class StandardCliTests(unittest.TestCase):
             previous_image, previous_json, previous_meta
         )
 
+    def test_plotting_accepts_lowercase_and_uppercase_previous_shortcuts(self) -> None:
+        module = self.modules["plotting"]
+        root = Mock()
+        root.winfo_screenwidth.return_value = 1200
+        root.winfo_screenheight.return_value = 800
+        label = Mock()
+
+        with patch.object(module.tk, "Label", return_value=label), patch.object(
+            module.ImageViewer, "poll_queue"
+        ):
+            viewer = module.ImageViewer(
+                root,
+                SimpleNamespace(root=Path("/evaluation")),
+                set(),
+                queue.Queue(),
+            )
+
+        root.bind.assert_any_call("p", viewer.on_previous)
+        root.bind.assert_any_call("P", viewer.on_previous)
+
     def test_plotting_validates_plain_and_directional_labels(self) -> None:
         module = self.modules["plotting"]
         self.assertEqual(
@@ -1317,6 +1338,16 @@ class StandardCliTests(unittest.TestCase):
             self.assertEqual(result["list"][0]["label"], "??Ex 10 : 1)a)")
             self.assertIn("keeping them with a ?? prefix", output.getvalue())
 
+    def test_correction_response_preserves_ambiguous_latex_commands(self) -> None:
+        module = self.modules["correction"]
+        parsed = module.parse_correction_response(
+            r'[{"result":{"feedback":[{"text":"$\forall x, f \big(x\big) \to x$"}]}}]'
+        )
+        self.assertEqual(
+            parsed[0]["result"]["feedback"][0]["text"],
+            r"$\forall x, f \big(x\big) \to x$",
+        )
+
     def test_correction_overwrite_keeps_previous_state_until_a_commit(self) -> None:
         module = self.modules["correction"]
         with tempfile.TemporaryDirectory() as directory:
@@ -1774,6 +1805,23 @@ class StandardCliTests(unittest.TestCase):
             r"Formulas $\frac{1}{2}$, $\theta \equiv 0 [2\pi]$, "
             r"$e \times x$, and [\negthinspace[0,n]",
         )
+        decoded_math_commands = (
+            "$"
+            + "\x0corall x, f "
+            + "\x08ig(x\x08ig) "
+            + "\to "
+            + "\text{false}$"
+        )
+        self.assertEqual(
+            module.clean_string(decoded_math_commands, {}),
+            r"$\forall x, f \big(x\big) \to \text{false}$",
+        )
+        self.assertEqual(
+            module.unresolved_math_control_paths(
+                {"feedback": ["Plain\fprose", "$unknown\fform$"]}
+            ),
+            ["$['feedback'][1]"],
+        )
         self.assertEqual(
             module.clean_string("x ∈ A and B ⊂ C", {}),
             r"x \ensuremath{\in} A and B \ensuremath{\subset} C",
@@ -1800,6 +1848,19 @@ class StandardCliTests(unittest.TestCase):
             self.assertEqual((evaluation / "correction.json").read_bytes(), cleaned)
             self.assertEqual(backup.read_bytes(), original)
 
+        with tempfile.TemporaryDirectory() as directory:
+            evaluation = Path(directory) / "Exam"
+            evaluation.mkdir()
+            atomic_write_json(
+                evaluation / "correction.json",
+                {"text": "$unknown\fcommand$"},
+            )
+            output = io.StringIO()
+            with redirect_stdout(output):
+                result = module.run(EvaluationWorkspace(evaluation))
+            self.assertEqual(result, ExitCode.PARTIAL)
+            self.assertIn("$['text']", output.getvalue())
+
     def test_manual_resolution_with_no_actions_is_safe(self) -> None:
         module = self.modules["resolve_manual"]
         with tempfile.TemporaryDirectory() as directory:

tests/test_label_timeouts.py

@@ -104,6 +104,8 @@ class LabelTimeoutTests(unittest.TestCase):
                 patch.object(labels, "wait", side_effect=wait), redirect_stdout(output):
             result = labels.run(self.workspace, [], client=self.client, sleep=lambda _: None)
         self.assertEqual(result, ExitCode.SUCCESS)
+        self.assertIn("Label detection progress: 0/1 copy groups completed.", output.getvalue())
+        self.assertIn("Label detection progress: 1/1 copy groups completed.", output.getvalue())
         self.assertIn("1 copies outstanding", output.getvalue())
         self.assertIn("Copie01_01.jpg, attempt 1/3", output.getvalue())
         self.assertIn("elapsed for image", output.getvalue())

tests/test_latex_json.py

@@ -1,7 +1,11 @@
 import json
 import unittest
 
-from copienator.latex_json import repair_latex_json, normalize_literal_newlines
+from copienator.latex_json import (
+    normalize_literal_newlines,
+    repair_decoded_latex_controls,
+    repair_latex_json,
+)
 from copienator.commands.gemini_for_enonce import ExamQuestions, ExamSolutions, ExamContext, GroupRubrics
 
 
@@ -44,6 +48,50 @@ class LatexJsonTests(unittest.TestCase):
         self.assertEqual(repair_latex_json(raw),
                          r'{"label":"\not", "other":"\frac", "rubric_content":"\\frac"}')
 
+    def test_feedback_text_can_be_repaired_before_json_decoding(self):
+        raw = (
+            r'{"text":"$\forall x, f \big(x\big) \neq x \to \text{false}$",'
+            r'"other":"\forall"}'
+        )
+        repaired = repair_latex_json(
+            raw,
+            additional_content_fields={"text"},
+        )
+        parsed = json.loads(repaired)
+        self.assertEqual(
+            parsed["text"],
+            r"$\forall x, f \big(x\big) \neq x \to \text{false}$",
+        )
+        self.assertEqual(parsed["other"], "\x0corall")
+
+        valid_prose = json.dumps({"text": "First line\ntext outside math"})
+        self.assertEqual(
+            repair_latex_json(
+                valid_prose,
+                additional_content_fields={"text"},
+            ),
+            valid_prose,
+        )
+
+    def test_decoded_control_repair_is_limited_to_known_commands_in_math(self):
+        corrupted = (
+            "$"
+            + "\x0corall x, f "
+            + "\x08ig(x\x08ig) "
+            + "\neq x "
+            + "\to "
+            + "\text{false}$"
+        )
+        self.assertEqual(
+            repair_decoded_latex_controls(corrupted),
+            r"$\forall x, f \big(x\big) \neq x \to \text{false}$",
+        )
+        ordinary_whitespace = "First paragraph\nnext line\tindented"
+        self.assertEqual(
+            repair_decoded_latex_controls(ordinary_whitespace),
+            ordinary_whitespace,
+        )
+
     def test_does_not_repair_structural_errors(self):
         with self.assertRaises(json.JSONDecodeError):
             json.loads(repair_latex_json(r'{"question_content":"\frac", broken}'))

tests/test_syncthing.py

@@ -1,8 +1,16 @@
 import subprocess
+import os
+import tkinter as tk
 import unittest
 from unittest.mock import patch
 
-from copienator_gui.syncthing import SERVICE, control_service
+from copienator_gui.syncthing import (
+    SERVICE,
+    SYSTEMCTL,
+    SyncthingPanel,
+    control_service,
+    service_status,
+)
 
 
 class SyncthingTests(unittest.TestCase):
@@ -16,7 +24,7 @@ class SyncthingTests(unittest.TestCase):
         with patch("copienator_gui.syncthing.service_status", side_effect=["inactive", "active"]), \
                 patch("copienator_gui.syncthing.subprocess.run", return_value=subprocess.CompletedProcess([], 0)) as run:
             self.assertEqual(control_service("ensure"), "active")
-        self.assertEqual(run.call_args.args[0], ["systemctl", "--no-ask-password", "start", SERVICE])
+        self.assertEqual(run.call_args.args[0], [*SYSTEMCTL, "start", SERVICE])
 
     def test_failed_start_reports_error(self):
         with patch("copienator_gui.syncthing.service_status", return_value="inactive"), \
@@ -28,4 +36,36 @@ class SyncthingTests(unittest.TestCase):
         with patch("copienator_gui.syncthing.service_status", return_value="inactive"), \
                 patch("copienator_gui.syncthing.subprocess.run", return_value=subprocess.CompletedProcess([], 0)) as run:
             self.assertEqual(control_service("stop"), "inactive")
-        self.assertEqual(run.call_args.args[0], ["systemctl", "--no-ask-password", "stop", SERVICE])
+        self.assertEqual(run.call_args.args[0], [*SYSTEMCTL, "stop", SERVICE])
+
+    def test_status_uses_the_non_privileged_user_service(self):
+        with patch(
+            "copienator_gui.syncthing.subprocess.run",
+            return_value=subprocess.CompletedProcess([], 0, stdout="active\n"),
+        ) as run:
+            self.assertEqual(service_status(), "active")
+        self.assertEqual(
+            run.call_args.args[0],
+            [*SYSTEMCTL, "show", SERVICE, "--property=ActiveState", "--value"],
+        )
+
+
+@unittest.skipUnless(os.environ.get("DISPLAY"), "Tk requires a display")
+class SyncthingPanelTests(unittest.TestCase):
+    def test_failed_automatic_start_warns_and_continues_export(self):
+        root = tk.Tk()
+        self.addCleanup(root.destroy)
+        with patch("copienator_gui.syncthing.threading.Thread.start"):
+            panel = SyncthingPanel(root)
+        panel.pack()
+        continued = []
+        panel.pending_export = lambda: continued.append(True)
+        panel.busy = True
+        panel.events.put(("ensure", None, "Access denied"))
+
+        with patch("copienator_gui.syncthing.messagebox.showwarning") as warning:
+            panel.poll()
+
+        warning.assert_called_once()
+        self.assertIn("L’export va continuer", warning.call_args.args[1])
+        self.assertEqual(continued, [True])