Modifiers: Support applying modifiers for multi-user data

The current behaviour is to prevent multi-user data from having its
modifier applied.

Instead, with this patch, we now warn the user that if they want to
proceed the object will be made single-user.

Note that this only makes the object data single-user. Not the material
or actions.

As a future step we can apply the same behaviour for the Grease Pencil modifiers

Differential Revision: https://developer.blender.org/D14381

1 files changed, 13 insertions, 0 deletions

diff --git a/source/blender/editors/object/object_relations.c b/source/blender/editors/object/object_relations.c
index 064a84cdea5..7be46bdb24b 100644
--- a/source/blender/editors/object/object_relations.c
+++ b/source/blender/editors/object/object_relations.c
@@ -1893,6 +1893,19 @@ static void single_obdata_users(
   }
 }
 
+void ED_object_single_obdata_user(Main *bmain, Scene *scene, Object *ob)
+{
+  FOREACH_SCENE_OBJECT_BEGIN (scene, ob_iter) {
+    ob_iter->flag &= ~OB_DONE;
+  }
+  FOREACH_SCENE_OBJECT_END;
+
+  /* Tag only the one object. */
+  ob->flag |= OB_DONE;
+
+  single_obdata_users(bmain, scene, NULL, NULL, OB_DONE);
+}
+
 static void single_object_action_users(
     Main *bmain, Scene *scene, ViewLayer *view_layer, View3D *v3d, const int flag)
 {