[gimp] app: fix selecting an object in an icon view.

[Jehan <jehanp src gnome org>]

commit 60bf8cd87ef7264cb1643c1825eda3ab18542cfd
Author: Jehan <jehan girinstud io>
Date:   Sun Nov 7 17:55:30 2021 +0100

    app: fix selecting an object in an icon view.
    
    We must make sure to care about slight discrepancies between context
    object and actually selected icon representing an object, which might be
    slightly different at selection change time (just before everything
    syncs up).

 app/widgets/gimpcontainereditor.c   | 13 ++++++++
 app/widgets/gimpcontainericonview.c | 62 +++++++++++++++++++++++++++++++++++--
 2 files changed, 73 insertions(+), 2 deletions(-)
---
diff --git a/app/widgets/gimpcontainereditor.c b/app/widgets/gimpcontainereditor.c
index 730918adf4..c2c2f4c26c 100644
--- a/app/widgets/gimpcontainereditor.c
+++ b/app/widgets/gimpcontainereditor.c
@@ -448,6 +448,19 @@ gimp_container_editor_select_items (GimpContainerView   *view,
   if (klass->select_item)
     klass->select_item (editor, viewable);
 
+  if (editor->priv->container)
+    {
+      const gchar *signal_name;
+      GType        children_type;
+
+      children_type = gimp_container_get_children_type (editor->priv->container);
+      signal_name   = gimp_context_type_to_signal_name (children_type);
+
+      if (signal_name)
+        gimp_context_set_by_type (editor->priv->context, children_type,
+                                  GIMP_OBJECT (viewable));
+    }
+
   if (gimp_editor_get_ui_manager (GIMP_EDITOR (editor->view)))
     gimp_ui_manager_update (gimp_editor_get_ui_manager (GIMP_EDITOR (editor->view)),
                             gimp_editor_get_popup_data (GIMP_EDITOR (editor->view)));
diff --git a/app/widgets/gimpcontainericonview.c b/app/widgets/gimpcontainericonview.c
index 4c9ee1b147..4556faf21d 100644
--- a/app/widgets/gimpcontainericonview.c
+++ b/app/widgets/gimpcontainericonview.c
@@ -579,11 +579,32 @@ gimp_container_icon_view_selection_changed (GtkIconView           *gtk_icon_view
                                             GimpContainerIconView *icon_view)
 {
   GimpContainerView *view = GIMP_CONTAINER_VIEW (icon_view);
-  GList             *items;
+  GList             *items = NULL;
   GList             *paths;
+  GList             *list;
+
+  paths = gtk_icon_view_get_selected_items (icon_view->view);
+
+  for (list = paths; list; list = list->next)
+    {
+      GtkTreeIter       iter;
+      GimpViewRenderer *renderer;
+
+      gtk_tree_model_get_iter (GTK_TREE_MODEL (icon_view->model), &iter,
+                               (GtkTreePath *) list->data);
+
+      gtk_tree_model_get (icon_view->model, &iter,
+                          GIMP_CONTAINER_TREE_STORE_COLUMN_RENDERER, &renderer,
+                          -1);
+
+      if (renderer->viewable)
+        items = g_list_prepend (items, renderer->viewable);
+
+      g_object_unref (renderer);
+    }
 
-  gimp_container_icon_view_get_selected (view, &items, &paths);
   gimp_container_view_multi_selected (view, items, paths);
+
   g_list_free_full (paths, (GDestroyNotify) gtk_tree_path_free);
   g_list_free (items);
 }
@@ -780,6 +801,43 @@ gimp_container_icon_view_get_selected (GimpContainerView    *view,
   GimpContainerIconView *icon_view = GIMP_CONTAINER_ICON_VIEW (view);
   GList                 *selected_paths;
   gint                   selected_count;
+  GimpContainer         *container;
+
+  container = gimp_container_view_get_container (view);
+
+  if (container)
+    {
+      const gchar *signal_name;
+      GimpContext *context;
+      GType        children_type;
+
+      context       = gimp_container_view_get_context (view);
+      children_type = gimp_container_get_children_type (container);
+      signal_name   = gimp_context_type_to_signal_name (children_type);
+
+      /* As a special case, for containers tied to a context object, we
+       * look up this object as being selected.
+       * */
+      if (signal_name && context)
+        {
+          GimpObject  *object;
+
+          object  = gimp_context_get_by_type (context, children_type);
+
+          selected_count = object ? 1 : 0;
+          if (items)
+            {
+              if (object)
+                *items = g_list_prepend (NULL, object);
+              else
+                *items = NULL;
+            }
+          if (paths)
+            *paths = NULL;
+
+          return selected_count;
+        }
+    }
 
   selected_paths = gtk_icon_view_get_selected_items (icon_view->view);
   selected_count = g_list_length (selected_paths);