source/blender/editors/interface/interface_handlers.cc

@@ -6017,6 +6017,10 @@ static int ui_do_but_SCROLL(
       const bool is_motion = (event->type == MOUSEMOVE);
       if (ui_numedit_but_SLI(
               but, data, (horizontal) ? mx : my, horizontal, is_motion, false, false)) {
+        /* Scrollbars in popups need UI layout refresh to update the right items to show. */
+        if (ui_block_is_popup_any(but->block)) {
+          ED_region_tag_refresh_ui(data->region);
+        }
         ui_numedit_apply(C, block, but, data);
       }
     }