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, 5 insertions, 2 deletions

diff --git a/source/blender/editors/include/ED_node.h b/source/blender/editors/include/ED_node.h
index eedee9d5280..ae2b4989069 100644
--- a/source/blender/editors/include/ED_node.h
+++ b/source/blender/editors/include/ED_node.h
@@ -111,8 +111,11 @@ void ED_node_composite_job(const struct bContext *C,
 void ED_operatormacros_node(void);
 
 /* node_view.c */
-bool ED_space_node_color_sample(
-    struct Main *bmain, struct SpaceNode *snode, struct ARegion *ar, int mval[2], float r_col[3]);
+bool ED_space_node_color_sample(struct Main *bmain,
+                                struct SpaceNode *snode,
+                                struct ARegion *region,
+                                int mval[2],
+                                float r_col[3]);
 
 #ifdef __cplusplus
 }