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, 1 insertions, 1 deletions

diff --git a/source/blender/windowmanager/WM_types.h b/source/blender/windowmanager/WM_types.h
index 8c278319fd5..b9dd6b3923d 100644
--- a/source/blender/windowmanager/WM_types.h
+++ b/source/blender/windowmanager/WM_types.h
@@ -892,7 +892,7 @@ typedef struct wmTooltipState {
   struct ARegion *region;
   /** Create the tooltip region (assign to 'region'). */
   struct ARegion *(*init)(struct bContext *C,
-                          struct ARegion *ar,
+                          struct ARegion *region,
                           int *pass,
                           double *pass_delay,
                           bool *r_exit_on_event);