source/blender/blenkernel/intern/grease_pencil.cc

@@ -92,7 +92,7 @@ static void grease_pencil_copy_data(Main * /*bmain*/,
         break;
       }
     }
-    grease_pencil_dst->drawing_array[i]->user_count = src_drawing_base->user_count;
+    /* TODO: Update drawing user counts. */
   }
 
   /* Do not copy layer tree storage. */
@@ -900,11 +900,12 @@ void GreasePencil::add_empty_drawings(const int add_size)
   for (const int i : new_drawings.index_range()) {
     new_drawings[i] = reinterpret_cast<GreasePencilDrawingBase *>(
         MEM_new<GreasePencilDrawing>(__func__));
-    new_drawings[i]->user_count = 0;
     GreasePencilDrawing *drawing = reinterpret_cast<GreasePencilDrawing *>(new_drawings[i]);
     new (&drawing->geometry) bke::CurvesGeometry();
     drawing->runtime = MEM_new<bke::GreasePencilDrawingRuntime>(__func__);
   }
+
+  /* TODO: Update drawing user counts. */
 }
 
 void GreasePencil::remove_drawing(const int index_to_remove)

source/blender/blenkernel/intern/grease_pencil_convert_legacy.cc

@@ -248,10 +248,11 @@ void legacy_gpencil_to_grease_pencil(Main &bmain, GreasePencil &grease_pencil, b
       new_frame.type = gpf->key_type;
       SET_FLAG_FROM_TEST(new_frame.flag, (gpf->flag & GP_FRAME_SELECT), GP_FRAME_SELECTED);
       new_layer.insert_frame(gpf->framenum, std::move(new_frame));
-      drawing.base.user_count = 1;
       i++;
     }
 
+    /* TODO: Update drawing user counts. */
+
     new_layer.tag_frames_map_keys_changed();
   }
 

source/blender/makesdna/DNA_grease_pencil_types.h

@@ -79,11 +79,6 @@ typedef struct GreasePencilDrawingBase {
    * Flag. Used to set e.g. the selection status. See `GreasePencilDrawingBaseFlag`.
    */
   uint32_t flag;
-  /**
-   * Number of users of this drawing in the layer tree.
-   */
-  int32_t user_count;
-  char _pad2[4];
 } GreasePencilDrawingBase;
 
 /**