master d9f674aea50: Fix opaque region specification on no-toolkit builds

[Po Lu]

branch: master
commit d9f674aea50cf1fe6ac138f14b602ce2d0f5cf77
Author: Po Lu <luangruo@yahoo.com>
Commit: Po Lu <luangruo@yahoo.com>

    Fix opaque region specification on no-toolkit builds
    
    * src/xterm.c (handle_one_xevent): Always specify opaque region
    on no-toolkit builds upon a configure event for any's window.
---
 src/xterm.c | 27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

diff --git a/src/xterm.c b/src/xterm.c
index d621d94a2cf..0899fcdc2d6 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -21178,14 +21178,28 @@ handle_one_xevent (struct x_display_info *dpyinfo,
        x_cr_update_surface_desired_size (any,
                                          configureEvent.xconfigure.width,
                                          configureEvent.xconfigure.height);
-      if (f || (any && configureEvent.xconfigure.window == FRAME_X_WINDOW 
(any)))
-       x_update_opaque_region (f ? f : any, &configureEvent);
 #endif
+
+#if !defined USE_X_TOOLKIT && !defined USE_GTK
+
+      /* Make the new size of the frame its opaque region.  This is a
+        region describing areas of the window which are always
+        guaranteed to be completely opaque and can be treated as such
+        by the compositor.  It is set to the width and height of the
+        only window in no-toolkit builds when `alpha_background' is
+        not set, and is cleared otherwise.  */
+
+      if (f || (any && configureEvent.xconfigure.window
+               == FRAME_OUTER_WINDOW (any)))
+       x_update_opaque_region (f ? f : any, &configureEvent);
+
+#endif /* !defined USE_X_TOOLKIT && !defined USE_GTK */
+
 #ifdef USE_GTK
       if (!f
          && (f = any)
          && configureEvent.xconfigure.window == FRAME_X_WINDOW (f)
-         && (FRAME_VISIBLE_P(f)
+         && (FRAME_VISIBLE_P (f)
              || !(configureEvent.xconfigure.width <= 1
                   && configureEvent.xconfigure.height <= 1)))
         {
@@ -21212,10 +21226,9 @@ handle_one_xevent (struct x_display_info *dpyinfo,
           f = 0;
        }
 #endif
-      if (f
-         && (FRAME_VISIBLE_P(f)
-             || !(configureEvent.xconfigure.width <= 1
-                  && configureEvent.xconfigure.height <= 1)))
+      if (f && (FRAME_VISIBLE_P (f)
+               || !(configureEvent.xconfigure.width <= 1
+                    && configureEvent.xconfigure.height <= 1)))
        {
 #ifdef USE_GTK
          /* For GTK+ don't call x_net_wm_state for the scroll bar