[mutter] frame: Always use the client window's visual for our frame

[Jasper St. Pierre <jstpierre src gnome org>]

commit f3fecd478d5693a6381a3ab7912173c2bca85dbb
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Wed Apr 1 14:52:31 2015 -0700

    frame: Always use the client window's visual for our frame
    
    Since the frame is the window that's redirected, there's no reason for
    it to match the root window. There *is*, however, a big incentive to
    match the window's visual, since not doing so might trigger automatic
    redirection.
    
    On a specific platform, we construct a depth-32 root window, and stick a
    depth-24 child window inside it. The frame ends up being created
    depth-32, not depth-24, so we get automatic redirection.

 src/core/frame.c |   26 +-------------------------
 1 files changed, 1 insertions(+), 25 deletions(-)
---
diff --git a/src/core/frame.c b/src/core/frame.c
index 0ab30e4..9335fb6 100644
--- a/src/core/frame.c
+++ b/src/core/frame.c
@@ -37,7 +37,6 @@ meta_window_ensure_frame (MetaWindow *window)
 {
   MetaFrame *frame;
   XSetWindowAttributes attrs;
-  Visual *visual;
   gulong create_serial;
 
   if (window->frame)
@@ -58,37 +57,14 @@ meta_window_ensure_frame (MetaWindow *window)
   frame->is_flashing = FALSE;
   frame->borders_cached = FALSE;
 
-  meta_verbose ("Framing window %s: visual %s default, depth %d default depth %d\n",
-                window->desc,
-                XVisualIDFromVisual (window->xvisual) ==
-                XVisualIDFromVisual (window->screen->default_xvisual) ?
-                "is" : "is not",
-                window->depth, window->screen->default_depth);
   meta_verbose ("Frame geometry %d,%d  %dx%d\n",
                 frame->rect.x, frame->rect.y,
                 frame->rect.width, frame->rect.height);
 
-  /* Default depth/visual handles clients with weird visuals; they can
-   * always be children of the root depth/visual obviously, but
-   * e.g. DRI games can't be children of a parent that has the same
-   * visual as the client. NULL means default visual.
-   *
-   * We look for an ARGB visual if we can find one, otherwise use
-   * the default of NULL.
-   */
-
-  /* Special case for depth 32 windows (assumed to be ARGB),
-   * we use the window's visual. Otherwise we just use the system visual.
-   */
-  if (window->depth == 32)
-    visual = window->xvisual;
-  else
-    visual = NULL;
-
   frame->ui_frame = meta_ui_create_frame (window->screen->ui,
                                           window->display->xdisplay,
                                           frame->window,
-                                          visual,
+                                          window->xvisual,
                                           frame->rect.x,
                                           frame->rect.y,
                                           frame->rect.width,