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Disable backfilling of windows created with bg=none, which otherwise
would force a framebuffer readback.

--- ./composite/compalloc.c.spiffiffity	2006-03-13 16:59:55.000000000 -0500
+++ ./composite/compalloc.c	2006-04-12 16:37:50.000000000 -0400
@@ -478,6 +478,7 @@
      * Copy bits from the parent into the new pixmap so that it will
      * have "reasonable" contents in case for background None areas.
      */
+#if 0
     if (pGC)
     {
 	XID val = IncludeInferiors;
@@ -492,6 +493,7 @@
 			       w, h, 0, 0);
 	FreeScratchGC (pGC);
     }
+#endif
     return pPixmap;
 }