[clutter] x11/stage: Leave a comment about multi-head setup

[Emmanuele Bassi <ebassi src gnome org>]

commit 25bf0b72f65ad7f7c931581f6ccb9e266addb3bc
Author: Emmanuele Bassi <ebassi linux intel com>
Date:   Tue Apr 10 12:34:54 2012 +0100

    x11/stage: Leave a comment about multi-head setup
    
    The get_geometry() implementation is broken on multi-head systems; the
    only solution is to use XRandR to get the size of the CRTC that contains
    the stage.

 clutter/x11/clutter-stage-x11.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/clutter/x11/clutter-stage-x11.c b/clutter/x11/clutter-stage-x11.c
index 48d71f4..c02b751 100644
--- a/clutter/x11/clutter-stage-x11.c
+++ b/clutter/x11/clutter-stage-x11.c
@@ -208,7 +208,14 @@ clutter_stage_x11_get_geometry (ClutterStageWindow    *stage_window,
 
   geometry->x = geometry->y = 0;
 
-  /* If we're fullscreen, return the size of the display. */
+  /* If we're fullscreen, return the size of the display.
+   *
+   * FIXME - this is utterly broken for anything that is not a single
+   * head set up; the window manager will give us the right size in a
+   * ConfigureNotify, but between the fullscreen signal emission on the
+   * stage and the following frame, the size returned by the stage will
+   * be wrong.
+   */
   if (_clutter_stage_is_fullscreen (stage_cogl->wrapper) &&
       stage_x11->fullscreening)
     {