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/makesdna/DNA_screen_types.h b/source/blender/makesdna/DNA_screen_types.h
index 8fec5354d36..189f5542ea0 100644
--- a/source/blender/makesdna/DNA_screen_types.h
+++ b/source/blender/makesdna/DNA_screen_types.h
@@ -178,7 +178,7 @@ typedef struct Panel {
  * - #ARegion.panels_category_active (#PanelCategoryStack)
  *   is basically a list of strings (category id's).
  *
- * Clicking on a tab moves it to the front of ar->panels_category_active,
+ * Clicking on a tab moves it to the front of region->panels_category_active,
  * If the context changes so this tab is no longer displayed,
  * then the first-most tab in #ARegion.panels_category_active is used.
  *
@@ -417,7 +417,7 @@ typedef struct ARegion {
   short flag;
 
   /** Current split size in unscaled pixels (if zero it uses regiontype).
-   * To convert to pixels use: `UI_DPI_FAC * ar->sizex + 0.5f`.
+   * To convert to pixels use: `UI_DPI_FAC * region->sizex + 0.5f`.
    * However to get the current region size, you should usually use winx/winy from above, not this!
    */
   short sizex, sizey;