Region post redraw is now split up in a view space and pixel space

part. This fixes a bug where transform help line drawing would not
work with view clipping and mess up the z-buffer. This avoids the
transform code having to figure out what kind of opengl state is
enabled and disable it temporarily.

source/blender/editors/space_api/spacetypes.c

@@ -151,10 +151,6 @@ void ED_spacetypes_keymap(wmKeyConfig *keyconf)
 
 /* ********************** custom drawcall api ***************** */
 
-/* type */
-#define REGION_DRAW_PRE		1
-#define REGION_DRAW_POST	0
-
 typedef struct RegionDrawCB {
 	struct RegionDrawCB *next, *prev;