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, 3 deletions

diff --git a/source/blender/editors/space_api/spacetypes.c b/source/blender/editors/space_api/spacetypes.c
index 9056bbb1246..d34b1ccb899 100644
--- a/source/blender/editors/space_api/spacetypes.c
+++ b/source/blender/editors/space_api/spacetypes.c
@@ -263,13 +263,13 @@ void ED_region_draw_cb_exit(ARegionType *art, void *handle)
   }
 }
 
-void ED_region_draw_cb_draw(const bContext *C, ARegion *ar, int type)
+void ED_region_draw_cb_draw(const bContext *C, ARegion *region, int type)
 {
   RegionDrawCB *rdc;
 
-  for (rdc = ar->type->drawcalls.first; rdc; rdc = rdc->next) {
+  for (rdc = region->type->drawcalls.first; rdc; rdc = rdc->next) {
     if (rdc->type == type) {
-      rdc->draw(C, ar, rdc->customdata);
+      rdc->draw(C, region, rdc->customdata);
     }
   }
 }