Patch Gnome 3.30 for Workspace-Gridhttps://medium.com/@hkdb/patch-gnome-3-30-for-workspace-grid-1ee8b1dd92f9

mutter_fix_scroll.patch

--- ./mutter-3.30.2_orig/src/core/meta-workspace-manager.c	2019-05-22 05:46:37.667434418 +0900
+++ ./mutter-3.30.2/src/core/meta-workspace-manager.c	2019-05-22 05:46:46.859495121 +0900
@@ -200,6 +200,8 @@ meta_workspace_manager_new (MetaDisplay
    * variable values in update_num_workspaces ()
    * This can be overriden using _NET_DESKTOP_LAYOUT in
    * meta_x11_display_new (), if it's specified */
+  workspace_manager->workspace_layout_overridden = FALSE;
+
   meta_workspace_manager_update_workspace_layout (workspace_manager,
                                                   META_DISPLAY_TOPLEFT,
                                                   FALSE,
@@ -502,7 +504,7 @@ meta_workspace_manager_override_workspac
                                                   n_rows,
                                                   n_columns);
 
-  workspace_manager->workspace_layout_overridden = TRUE;
+  workspace_manager->workspace_layout_overridden = FALSE;
 }
 
 #ifdef WITH_VERBOSE_MODE