Gizmo: add the ability to postpone refreshing while tweaking

This resolves a logical problem using tweak as a fallback tool.
See: T66304#828742

The select action would immediately show the gizmo underneath it,
then the tweak would be handled by the gizmo instead of moving the item
under the cursor.

Currently this works by hiding the gizmo until the tweak event ends.
While it's simpler to check if the gizmo received a mouse-down event,
it causes flickering before each drag event which feels like a glitch.

This is optional for each gizmo type because there are cases where this
can be useful to activate the gizmo immediately (mesh rip for example).

1 files changed, 2 insertions, 1 deletions

diff --git a/source/blender/editors/transform/transform_gizmo_extrude_3d.c b/source/blender/editors/transform/transform_gizmo_extrude_3d.c
index da6b0285a5c..fb33471cf3f 100644
--- a/source/blender/editors/transform/transform_gizmo_extrude_3d.c
+++ b/source/blender/editors/transform/transform_gizmo_extrude_3d.c
@@ -514,7 +514,8 @@ void VIEW3D_GGT_xform_extrude(struct wmGizmoGroupType *gzgt)
   gzgt->name = "3D View Extrude";
   gzgt->idname = "VIEW3D_GGT_xform_extrude";
 
-  gzgt->flag = WM_GIZMOGROUPTYPE_3D | WM_GIZMOGROUPTYPE_TOOL_FALLBACK_KEYMAP;
+  gzgt->flag = WM_GIZMOGROUPTYPE_3D | WM_GIZMOGROUPTYPE_TOOL_FALLBACK_KEYMAP |
+               WM_GIZMOGROUPTYPE_DELAY_REFRESH_FOR_TWEAK;
 
   gzgt->gzmap_params.spaceid = SPACE_VIEW3D;
   gzgt->gzmap_params.regionid = RGN_TYPE_WINDOW;