master 77bf4ca000: Respect `alpha-background' drawing relief corners

[Po Lu]

branch: master
commit 77bf4ca000b4d1c901907c774e7bb342b6f24f1e
Author: Po Lu <luangruo@yahoo.com>
Commit: Po Lu <luangruo@yahoo.com>

    Respect `alpha-background' drawing relief corners
    
    * src/xterm.c (x_draw_relief_rect): Respect background alpha for
    corner rects.
---
 src/xterm.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/src/xterm.c b/src/xterm.c
index 40c80eb1f7..d44554df7b 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -7614,19 +7614,25 @@ x_draw_relief_rect (struct frame *f, int left_x, int 
top_y, int right_x,
     {
       if (left_p && top_p && x_inside_rect_p (clip_rect, 1,
                                              left_x, top_y))
-       x_clear_rectangle (f, normal_gc, left_x, top_y, 1, 1, false);
+       /* This should respect `alpha-backgroun' since it's being
+          cleared with the background color of the frame.  */
+       x_clear_rectangle (f, normal_gc, left_x, top_y, 1, 1,
+                          true);
 
       if (left_p && bot_p && x_inside_rect_p (clip_rect, 1,
                                              left_x, bottom_y))
-       x_clear_rectangle (f, normal_gc, left_x, bottom_y, 1, 1, false);
+       x_clear_rectangle (f, normal_gc, left_x, bottom_y, 1, 1,
+                          true);
 
       if (right_p && top_p && x_inside_rect_p (clip_rect, 1,
                                               right_x, top_y))
-       x_clear_rectangle (f, normal_gc, right_x, top_y, 1, 1, false);
+       x_clear_rectangle (f, normal_gc, right_x, top_y, 1, 1,
+                          true);
 
       if (right_p && bot_p && x_inside_rect_p (clip_rect, 1,
                                               right_x, bottom_y))
-       x_clear_rectangle (f, normal_gc, right_x, bottom_y, 1, 1, false);
+       x_clear_rectangle (f, normal_gc, right_x, bottom_y, 1, 1,
+                          true);
     }
 
   x_reset_clip_rectangles (f, white_gc);