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, 3 insertions, 1 deletions

diff --git a/source/blender/editors/include/ED_space_api.h b/source/blender/editors/include/ED_space_api.h
index 9005ce1b3a5..ae4add2fca2 100644
--- a/source/blender/editors/include/ED_space_api.h
+++ b/source/blender/editors/include/ED_space_api.h
@@ -76,7 +76,9 @@ void ED_region_draw_cb_draw(const struct bContext *, struct ARegion *, int);
 void ED_region_draw_cb_exit(struct ARegionType *, void *);
 /* generic callbacks */
 /* ed_util.c */
-void ED_region_draw_mouse_line_cb(const struct bContext *C, struct ARegion *ar, void *arg_info);
+void ED_region_draw_mouse_line_cb(const struct bContext *C,
+                                  struct ARegion *region,
+                                  void *arg_info);
 
 #ifdef __cplusplus
 }