[gtk/ebassi/egl-x11] x11: Don't update GLX visuals with EGL

[Emmanuele Bassi <ebassi src gnome org>]

commit 69856a9aacfec7c23e9719228ba57664dbe69cdd
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Mon May 10 21:19:14 2021 +0100

    x11: Don't update GLX visuals with EGL
    
    We're going to get into a messy situation, with both GLX and EGL
    initialized.
    
    If we're already using EGL, skip the whole cache.

 gdk/x11/gdkglcontext-glx.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/gdk/x11/gdkglcontext-glx.c b/gdk/x11/gdkglcontext-glx.c
index d9f9cf51d4..4181168262 100644
--- a/gdk/x11/gdkglcontext-glx.c
+++ b/gdk/x11/gdkglcontext-glx.c
@@ -1022,6 +1022,9 @@ gdk_x11_screen_update_visuals_for_glx (GdkX11Screen *x11_screen)
   display_x11 = GDK_X11_DISPLAY (display);
   dpy = gdk_x11_display_get_xdisplay (display);
 
+  if (display_x11->have_egl)
+    return;
+
   /* We save the default visuals as a property on the root window to avoid
      having to initialize GL each time, as it may not be used later. */
   if (get_cached_gl_visuals (display, &system_visual_id, &rgba_visual_id))