[metacity] xrender: fix shaded windows regression

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 17a8c8b6474cf4f90f178611d5c53447619c604c
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Mon Sep 23 00:05:18 2019 +0300

    xrender: fix shaded windows regression
    
    When window is shaded client window is unmapped. Commit 433bf689997e
    replaced cw->attrs.map_state with cw->window->mapped that introduced
    regression - shaded windows are no longer visible.

 src/compositor/meta-compositor-xrender.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/compositor/meta-compositor-xrender.c b/src/compositor/meta-compositor-xrender.c
index fedf28c6..747912d2 100644
--- a/src/compositor/meta-compositor-xrender.c
+++ b/src/compositor/meta-compositor-xrender.c
@@ -1448,7 +1448,7 @@ paint_windows (MetaCompositorXRender *xrender,
           continue;
         }
 
-      if (!cw->window->mapped)
+      if (!meta_window_is_toplevel_mapped (cw->window))
         continue;
 
       if (cw->picture == None)
@@ -2445,7 +2445,7 @@ meta_compositor_xrender_add_window (MetaCompositor *compositor,
   xwindow = meta_window_get_xwindow (window);
   g_hash_table_insert (xrender->windows_by_xid, (gpointer) xwindow, cw);
 
-  if (cw->window->mapped)
+  if (meta_window_is_toplevel_mapped (cw->window))
     map_win (xrender, cw);
 
   meta_error_trap_pop (display);