Cleanup: Rename ARegion variables from ar to region

The old convention was easy to confuse with ScrArea.
Part of https://developer.blender.org/T74432.

This is mostly a batch rename with some manual fixing. Only single word
variable names are changed, no prefixed/suffixed names.

Brecht van Lommel and Campbell Barton both gave me a green light for
this convention change.

Also ran clan clang format on affected files.

1 files changed, 2 insertions, 2 deletions

diff --git a/source/blender/editors/transform/transform_gizmo_extrude_3d.c b/source/blender/editors/transform/transform_gizmo_extrude_3d.c
index fb33471cf3f..8b5db2b57ec 100644
--- a/source/blender/editors/transform/transform_gizmo_extrude_3d.c
+++ b/source/blender/editors/transform/transform_gizmo_extrude_3d.c
@@ -469,11 +469,11 @@ static void gizmo_mesh_extrude_message_subscribe(const bContext *C,
                                                  struct wmMsgBus *mbus)
 {
   GizmoExtrudeGroup *ggd = gzgroup->customdata;
-  ARegion *ar = CTX_wm_region(C);
+  ARegion *region = CTX_wm_region(C);
 
   /* Subscribe to view properties */
   wmMsgSubscribeValue msg_sub_value_gz_tag_refresh = {
-      .owner = ar,
+      .owner = region,
       .user_data = gzgroup->parent_gzmap,
       .notify = WM_gizmo_do_msg_notify_tag_refresh,
   };