Fix wrong usages of region align enumerations

`ARegion.alignment` unfortunately is a mixture of value and bitflag
enumerations. When checking for left/right/top/bottom region alignment,
the flags have to be masked out usually.
Most of the fixed cases here probably didn't cause issues in practice,
but could in fact break at any point when surrounding logic changes.

In fact the assert in #region_visible_rect_calc() failed in an older
file from https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=949035. This
fixes it.

1 files changed, 2 insertions, 2 deletions

diff --git a/source/blender/windowmanager/intern/wm_draw.c b/source/blender/windowmanager/intern/wm_draw.c
index 14d4e05b77a..a26a728461d 100644
--- a/source/blender/windowmanager/intern/wm_draw.c
+++ b/source/blender/windowmanager/intern/wm_draw.c
@@ -514,12 +514,12 @@ void wm_draw_region_blend(ARegion *ar, int view, bool blend)
 
   /* Slide vertical panels */
   float ofs_x = BLI_rcti_size_x(&ar->winrct) * (1.0f - alpha_easing);
-  if (ar->alignment == RGN_ALIGN_RIGHT) {
+  if (RGN_ALIGN_ENUM_FROM_MASK(ar->alignment) == RGN_ALIGN_RIGHT) {
     rect_geo.xmin += ofs_x;
     rect_tex.xmax *= alpha_easing;
     alpha = 1.0f;
   }
-  else if (ar->alignment == RGN_ALIGN_LEFT) {
+  else if (RGN_ALIGN_ENUM_FROM_MASK(ar->alignment) == RGN_ALIGN_LEFT) {
     rect_geo.xmax -= ofs_x;
     rect_tex.xmin += 1.0f - alpha_easing;
     alpha = 1.0f;