Fix T94089: GPencil Drawing don't Update after paste in Dopesheet

When paste new frames, the datablock need to be tagged to update the drawings.

source/blender/editors/gpencil/editaction_gpencil.c

@@ -46,6 +46,8 @@
 
 #include "WM_api.h"
 
+#include "DEG_depsgraph.h"
+
 /* ***************************************** */
 /* NOTE ABOUT THIS FILE:
  * This file contains code for editing Grease Pencil data in the Action Editor
@@ -481,6 +483,9 @@ bool ED_gpencil_anim_copybuf_paste(bAnimContext *ac, const short offset_mode)
       /* unapply offset from buffer-frame */
       gpfs->framenum -= offset;
     }
+
+    /* Tag destination datablock. */
+    DEG_id_tag_update(ale->id, ID_RECALC_TRANSFORM | ID_RECALC_GEOMETRY);
   }
 
   /* clean up */

source/blender/editors/space_action/action_edit.c

@@ -642,6 +642,10 @@ static int actkeys_paste_exec(bContext *C, wmOperator *op)
     }
   }
 
+  /* Grease Pencil needs extra update to refresh the added keyframes. */
+  if (ac.datatype == ANIMCONT_GPENCIL) {
+    WM_event_add_notifier(C, NC_GPENCIL | ND_DATA, NULL);
+  }
   /* set notifier that keyframes have changed */
   WM_event_add_notifier(C, NC_ANIMATION | ND_KEYFRAME | NA_EDITED, NULL);