Revision: 76951
          http://sourceforge.net/p/brlcad/code/76951
Author:   brlcad
Date:     2020-08-25 22:37:45 +0000 (Tue, 25 Aug 2020)
Log Message:
-----------
initialize the window's background color in case it's defaulting to nothing 
(i.e., transparent).  seems to matter on direct visuals with an alpha with 
latest X11.

Modified Paths:
--------------
    brlcad/trunk/src/libdm/glx/dm-ogl.c

Modified: brlcad/trunk/src/libdm/glx/dm-ogl.c
===================================================================
--- brlcad/trunk/src/libdm/glx/dm-ogl.c 2020-08-25 20:59:13 UTC (rev 76950)
+++ brlcad/trunk/src/libdm/glx/dm-ogl.c 2020-08-25 22:37:45 UTC (rev 76951)
@@ -887,6 +887,7 @@
     bu_vls_printf(&dmp->i->dm_tkName, "%s",
                  (char *)Tk_Name(pubvars->xtkwin));
 
+    Tk_SetWindowBackground(pubvars->xtkwin, 
BlackPixelOfScreen(Tk_Screen(pubvars->xtkwin)));
 
     if (bu_vls_strlen(&init_proc_vls) > 0) {
        bu_vls_printf(&str, "%s %s\n", bu_vls_addr(&init_proc_vls), 
bu_vls_addr(&dmp->i->dm_pathName));

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