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_convert_tracking.c b/source/blender/editors/transform/transform_convert_tracking.c
index b68b79adbd8..a8bde661342 100644
--- a/source/blender/editors/transform/transform_convert_tracking.c
+++ b/source/blender/editors/transform/transform_convert_tracking.c
@@ -518,7 +518,7 @@ static void createTransTrackingCurvesData(bContext *C, TransInfo *t)
 
 void createTransTrackingData(bContext *C, TransInfo *t)
 {
-  ARegion *ar = CTX_wm_region(C);
+  ARegion *region = CTX_wm_region(C);
   SpaceClip *sc = CTX_wm_space_clip(C);
   MovieClip *clip = ED_space_clip_get_clip(sc);
   int width, height;
@@ -537,7 +537,7 @@ void createTransTrackingData(bContext *C, TransInfo *t)
     return;
   }
 
-  if (ar->regiontype == RGN_TYPE_PREVIEW) {
+  if (region->regiontype == RGN_TYPE_PREVIEW) {
     /* transformation was called from graph editor */
     createTransTrackingCurvesData(C, t);
   }