[gtk+] Revert "gdk: enable rgba visuals by default"

[Matthias Clasen <matthiasc src gnome org>]

commit 15060a8f24bdce8fe2dac911059ca996f60c3456
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Feb 4 11:39:48 2014 -0500

    Revert "gdk: enable rgba visuals by default"
    
    This reverts commit a2ccb6601e0fb6dbe55517ad399728a00f6d7e40.
    
    This turns out to break GtkStatusIcon, and invalidates
    the documentation of gdk_screen_get_system_visual().

 docs/reference/gtk/running.sgml |    9 ---------
 gdk/x11/gdkvisual-x11.c         |    8 --------
 2 files changed, 0 insertions(+), 17 deletions(-)
---
diff --git a/docs/reference/gtk/running.sgml b/docs/reference/gtk/running.sgml
index c7d2d9b..8065e19 100644
--- a/docs/reference/gtk/running.sgml
+++ b/docs/reference/gtk/running.sgml
@@ -479,15 +479,6 @@ nevertheless.
 </formalpara>
 
 <formalpara>
-  <title><envar>GDK_RGBA</envar></title>
-
-  <para>
-    Since 3.12, this environment variable can be used to prevent
-    using RGBA visuals on the X11 backend by setting GDK_RGBA=0.
-  </para>
-</formalpara>
-
-<formalpara>
   <title><envar>XDG_DATA_HOME</envar>, <envar>XDG_DATA_DIRS</envar></title>
 
   <para>
diff --git a/gdk/x11/gdkvisual-x11.c b/gdk/x11/gdkvisual-x11.c
index 0c401f2..0898a9f 100644
--- a/gdk/x11/gdkvisual-x11.c
+++ b/gdk/x11/gdkvisual-x11.c
@@ -285,14 +285,6 @@ _gdk_x11_screen_init_visuals (GdkScreen *screen)
         }
     }
 
-  /* prefer the RGBA visual unless GDK_RGBA=0 */
-  if (x11_screen->rgba_visual)
-    {
-      const gchar *csd_env = g_getenv ("GDK_RGBA");
-      if (g_strcmp0 (csd_env, "0") != 0)
-          x11_screen->system_visual = x11_screen->rgba_visual;
-    }
-
 #ifdef G_ENABLE_DEBUG
   if (_gdk_debug_flags & GDK_DEBUG_MISC)
     {