[gnome-desktop] gnome-rr: Fix turning off tiled monitors

[Bastien Nocera <hadess src gnome org>]

commit 0e2f15588a89230e60a7dfe9f4164a8c17baa733
Author: Dave Airlie <airlied redhat com>
Date:   Tue Sep 22 17:23:50 2015 +1000

    gnome-rr: Fix turning off tiled monitors
    
    If you switch a tiled monitors off via the control panel,
    we need to propogate the change to the other tiles, when
    we get a geometry change.
    
    This fixes a problem with a tiled monitor only switching
    half off and confusing the desktop.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=755384

 libgnome-desktop/gnome-rr-output-info.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/libgnome-desktop/gnome-rr-output-info.c b/libgnome-desktop/gnome-rr-output-info.c
index 692e7ef..6d48001 100644
--- a/libgnome-desktop/gnome-rr-output-info.c
+++ b/libgnome-desktop/gnome-rr-output-info.c
@@ -244,7 +244,10 @@ static void gnome_rr_output_info_set_tiled_geometry (GnomeRROutputInfo *self, in
                 /* for primary tile only configs turn off non-primary
                    tiles - turn them on for tiled ones */
                 if (ht != 0 || vt != 0)
-                    outputs[i]->priv->on = !primary_tile_only;
+                    if (self->priv->on == FALSE)
+                        outputs[i]->priv->on = FALSE;
+                    else
+                        outputs[i]->priv->on = !primary_tile_only;
 
                 if (primary_tile_only)
                 {