[mutter/wayland] core: prevent early MetaIdleMonitor destruction when its invoker vanishes

[Rui Matos <rtcm src gnome org>]

commit bcd5446cdc981e6aaddfe659dad1f7341bc91c54
Author: Carlos Garnacho <carlosg gnome org>
Date:   Sat Feb 22 20:16:28 2014 +0100

    core: prevent early MetaIdleMonitor destruction when its invoker vanishes
    
    If the last reference of a MetaIdleMonitor is held by the caller, it may
    happen that the last reference is lost when calling the GDestroyNotify,
    if this happens when the watched DBus name vanishes, the object (and the
    watches hashtable) are destroyed while manipulating the watches hashtable,
    so bad things may happen then.
    
    Fix this by wrapping the operation by a ref/unref pair, so the object would
    be destroyed after operating on the hashtable.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=724969

 src/core/meta-idle-monitor.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/core/meta-idle-monitor.c b/src/core/meta-idle-monitor.c
index c99fc10..4f853ea 100644
--- a/src/core/meta-idle-monitor.c
+++ b/src/core/meta-idle-monitor.c
@@ -653,8 +653,10 @@ meta_idle_monitor_remove_watch (MetaIdleMonitor *monitor,
 {
   g_return_if_fail (META_IS_IDLE_MONITOR (monitor));
 
+  g_object_ref (monitor);
   g_hash_table_remove (monitor->watches,
                        GUINT_TO_POINTER (id));
+  g_object_unref (monitor);
 }
 
 /**