some fixes

python_app/gui/preprocess_dialog.py

@@ -354,8 +354,14 @@ class PreprocessDialog(QDialog):
         can_finalize: bool,
         can_capture_all: bool,
         variant_count: int = 1,
+        actions_enabled: bool = True,
     ) -> None:
-        """Update sequence progress/status widgets."""
+        """Update sequence progress/status widgets.
+
+        With ``actions_enabled=False`` the progress labels still update but every
+        sequence action button is kept disabled — used while a blocking capture
+        runs, so input queued during the freeze cannot trigger another action.
+        """
         if kind is None:
             self._active_kind_label.setText("<none>")
             self._progress_label.setText("0 / 0")
@@ -368,13 +374,14 @@ class PreprocessDialog(QDialog):
             self._capture_all_button.setText("Capture All Remaining")
             return
 
+        actions_enabled = bool(actions_enabled)
         active_label = preprocess_asset_display_name(kind) if kind in PREPROCESS_ASSET_SPECS else kind
         self._active_kind_label.setText(active_label)
         self._progress_label.setText(f"{captured_count} / {total_count}")
-        self._undo_last_button.setEnabled(bool(can_undo))
-        self._save_sequence_button.setEnabled(bool(can_finalize))
-        self._capture_all_button.setEnabled(bool(can_capture_all))
-        self._abort_button.setEnabled(True)
+        self._undo_last_button.setEnabled(bool(can_undo) and actions_enabled)
+        self._save_sequence_button.setEnabled(bool(can_finalize) and actions_enabled)
+        self._capture_all_button.setEnabled(bool(can_capture_all) and actions_enabled)
+        self._abort_button.setEnabled(actions_enabled)
         self._capture_all_button.setText("Capture All Remaining")
         if next_input is None or next_output is None:
             self._combo_label.setText("<complete>")
@@ -384,7 +391,7 @@ class PreprocessDialog(QDialog):
             if int(variant_count) > 1:
                 combo_text += f" | radar configs={int(variant_count)}"
             self._combo_label.setText(combo_text)
-            self._capture_next_button.setEnabled(True)
+            self._capture_next_button.setEnabled(actions_enabled)
 
     def set_available_sets(self, available_sets: dict[str, list[str]]) -> None:
         """Replace combo-box choices for all preprocess assets."""