Fix T66505: Dope Sheet shows empty Grease Pencil/Annotation layers

The behaviour of GP layers is the same as annotation layers: they show
in the dope sheet regardless of whether they have frames or not. This is
easily resolved by adding some extra filtering.

1 files changed, 5 insertions, 0 deletions

diff --git a/source/blender/editors/animation/anim_filter.c b/source/blender/editors/animation/anim_filter.c
index c1cd24f5a3c..8dfc9cd8d1a 100644
--- a/source/blender/editors/animation/anim_filter.c
+++ b/source/blender/editors/animation/anim_filter.c
@@ -1735,6 +1735,11 @@ static size_t animdata_filter_gpencil_layers_data(ListBase *anim_data,
       continue;
     }
 
+    /* Skip empty layers. */
+    if (BLI_listbase_is_empty(&gpl->frames)) {
+      continue;
+    }
+
     /* add to list */
     ANIMCHANNEL_NEW_CHANNEL(gpl, ANIMTYPE_GPLAYER, gpd, NULL);
   }