Fix cross-panel computation group handling for image-to-signal operations

When running cross-panel computations (image → signal) on a group of images,
results are now properly organized in a new signal group instead of being
added to the current group.

Previously, operations like "Analysis > Histogram" or "Radial profile" on
image groups would add results to the current signal group, inconsistent
with same-panel operations that create new groups.

Modified _compute_1_to_1_subroutine() to use _create_group_for_result()
and _add_object_to_appropriate_panel() for both native and cross-panel
computations, ensuring consistent group handling.

Added test_cross_panel_image_to_signal_group() to verify the fix.

Author: PierreRaybaut

CHANGELOG.md

@@ -486,6 +486,12 @@ See DataLab [roadmap page](https://datalab-platform.com/en/contributing/roadmap.
   * Users can now work smoothly with images containing extensive analysis results without performance degradation
   * This enhancement particularly benefits workflows involving blob detection, contour analysis, or peak detection that generate many geometric shapes
 
+* **Cross-panel computation group handling**: Fixed inconsistent behavior when running cross-panel computations (image to signal) on groups of objects
+  * When applying operations like "Analysis > Histogram" or "Operations > Intensity profiles > Radial profile" to a group of images, results are now organized in a new signal group (as expected)
+  * Previously, results were incorrectly added to the current signal group instead of creating a dedicated group
+  * This fix ensures consistent behavior between same-panel operations (e.g., signal → signal) and cross-panel operations (e.g., image → signal)
+  * Group creation now works uniformly for all 1-to-1 processing patterns regardless of whether results are native or non-native objects
+
 * **Action enable states not updated after operations**: Fixed issue where menu action states
   were not updated after performing annotation or metadata operations
   * After copying/pasting/deleting annotations or metadata, action states now refresh immediately

datalab/gui/processor/base.py

@@ -1051,28 +1051,22 @@ def _compute_1_to_1_subroutine(
                         )
                         insert_processing_parameters(new_obj, pp)
 
-                    # Is new object a native object (i.e. a Signal object for a Signal
-                    # Panel, or an Image object for an Image Panel) ?
-                    # (example of non-native object use case: image profile extraction)
-                    is_new_obj_native = isinstance(new_obj, self.panel.PARAMCLASS)
-
                     new_gid = None
-                    if grps and is_new_obj_native:
+                    if grps:
                         # If groups are selected, then it means that there is no
                         # individual object selected: we work on groups only
                         old_gid = self.panel.objmodel.get_object_group_id(obj)
                         new_gid = new_gids.get(old_gid)
                         if new_gid is None:
                             # Create a new group for each selected group
                             old_g = self.panel.objmodel.get_group(old_gid)
-                            new_g = self.panel.add_group(
-                                f"{name}({get_short_id(old_g)})"
+                            new_gid = self._create_group_for_result(
+                                new_obj, f"{name}({get_short_id(old_g)})"
                             )
-                            new_gids[old_gid] = new_gid = get_uuid(new_g)
-                    if is_new_obj_native:
-                        self.panel.add_object(new_obj, group_id=new_gid)
-                    else:
-                        self.panel.mainwindow.add_object(new_obj)
+                            new_gids[old_gid] = new_gid
+                    self._add_object_to_appropriate_panel(
+                        new_obj, group_id=new_gid, use_group_for_non_native=True
+                    )
         # Select newly created groups, if any
         for group_id in new_gids.values():
             self.panel.objview.set_current_item_id(group_id, extend=True)

datalab/tests/features/common/interactive_processing_test.py

@@ -535,6 +535,64 @@ def test_cross_panel_image_to_signal():
             assert not np.allclose(signal.y, original_signal_data)
 
 
+def test_cross_panel_image_to_signal_group():
+    """Test cross-panel processing with groups: Image group → Signal group"""
+    with qt_app_context():
+        with datalab_test_app_context() as win:
+            image_panel = win.imagepanel
+            signal_panel = win.signalpanel
+            image_processor = image_panel.processor
+
+            # Create a group of test images
+            group_name = "Test Images"
+            group = image_panel.add_group(group_name)
+            group_id = get_uuid(group)
+
+            # Create multiple test images in the group
+            n_images = 3
+            for i in range(n_images):
+                image_param = Gauss2DParam.create(
+                    x0=50.0 + i * 5,
+                    y0=50.0 + i * 5,
+                    sigma=10.0,
+                    a=100.0,
+                    height=100,
+                    width=100,
+                )
+                image_panel.new_object(param=image_param, edit=False)
+                # The new objects are automatically added to the current group
+
+            # Select the entire group
+            image_panel.objview.set_current_item_id(group_id, extend=False)
+
+            # Get the initial number of groups in signal panel
+            signal_groups_before = len(signal_panel.objmodel.get_groups())
+
+            # Apply radial_profile to the entire group (Image → Signal cross-panel)
+            profile_param = RadialProfileParam.create(x0=50, y0=50)
+            image_processor.run_feature("radial_profile", param=profile_param)
+
+            # Verify a NEW group was created in the signal panel
+            signal_groups_after = len(signal_panel.objmodel.get_groups())
+            assert signal_groups_after == signal_groups_before + 1, (
+                "Expected a new group to be created for cross-panel computation results"
+            )
+
+            # Verify that the new group contains the correct number of signals
+            signal_groups = signal_panel.objmodel.get_groups()
+            new_group = signal_groups[-1]  # Get the last (newly created) group
+            signals_in_group = new_group.get_objects()
+            assert len(signals_in_group) == n_images, (
+                f"Expected {n_images} signals in new group, got {len(signals_in_group)}"
+            )
+
+            # Verify the group name follows the expected pattern
+            assert "radial_profile" in new_group.title.lower(), (
+                f"Expected group name to contain 'radial_profile', "
+                f"got '{new_group.title}'"
+            )
+
+
 def test_cross_panel_signal_to_image():
     """Test cross-panel processing: Signal → Image (combine signals into image)"""
     with qt_app_context():
@@ -756,6 +814,7 @@ def test_select_source_objects_deleted_source():
     test_apply_processing_parameters_image()
     test_apply_processing_parameters_missing_source()
     test_cross_panel_image_to_signal()
+    test_cross_panel_image_to_signal_group()
     test_cross_panel_signal_to_image()
     test_select_source_objects_same_panel()
     test_select_source_objects_cross_panel()

doc/locale/fr/LC_MESSAGES/changelog.po

@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: DataLab \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2025-11-09 12:20+0100\n"
+"POT-Creation-Date: 2025-11-09 18:55+0100\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language: fr\n"
@@ -1387,6 +1387,21 @@ msgstr "Les utilisateurs peuvent désormais travailler sans problème avec des i
 msgid "This enhancement particularly benefits workflows involving blob detection, contour analysis, or peak detection that generate many geometric shapes"
 msgstr "Cette amélioration bénéficie particulièrement aux flux de travail impliquant la détection de blobs, l'analyse de contours ou la détection de pics qui génèrent de nombreuses formes géométriques."
 
+msgid "**Cross-panel computation group handling**: Fixed inconsistent behavior when running cross-panel computations (image to signal) on groups of objects"
+msgstr "**Gestion des groupes de calcul inter-panneaux** : Correction d'un comportement incohérent lors de l'exécution de calculs inter-panneaux (image vers signal) sur des groupes d'objets"
+
+msgid "When applying operations like \"Analysis > Histogram\" or \"Operations > Intensity profiles > Radial profile\" to a group of images, results are now organized in a new signal group (as expected)"
+msgstr "Lors de l'application d'opérations telles que \"Analyse > Histogramme\" ou \"Opérations > Profils d'intensité > Profil radial\" à un groupe d'images, les résultats sont désormais organisés dans un nouveau groupe de signaux (comme prévu)."
+
+msgid "Previously, results were incorrectly added to the current signal group instead of creating a dedicated group"
+msgstr "Auparavant, les résultats étaient incorrectement ajoutés au groupe de signaux actuel au lieu de créer un groupe dédié."
+
+msgid "This fix ensures consistent behavior between same-panel operations (e.g., signal → signal) and cross-panel operations (e.g., image → signal)"
+msgstr "Cette correction garantit un comportement cohérent entre les opérations dans le même panneau (par exemple, signal → signal) et les opérations inter-panneaux (par exemple, image → signal)."
+
+msgid "Group creation now works uniformly for all 1-to-1 processing patterns regardless of whether results are native or non-native objects"
+msgstr "La création de groupes fonctionne désormais de manière uniforme pour tous les modèles de traitement 1-à-1, qu'il s'agisse d'objets natifs ou non natifs."
+
 msgid "**Action enable states not updated after operations**: Fixed issue where menu action states were not updated after performing annotation or metadata operations"
 msgstr "**Les états d'activation des actions ne sont pas mis à jour après les opérations** : Correction d'un problème où les états des actions de menu n'étaient pas mis à jour après l'exécution d'opérations d'annotation ou de métadonnées"
 
@@ -3876,4 +3891,3 @@ msgstr "Symétrie (verticale/horizontale)"
 
 msgid "Console: added configurable external editor (default: VSCode) to follow the traceback links to the source code"
 msgstr "Console : ajout d'un éditeur externe configurable (par défaut : VSCode) pour suivre les liens de poursuite vers le code source"
-