[mutter] monitor-manager: Check active monitors when looking for logical monitor

[Jonas Ådahl <jadahl src gnome org>]

commit c214eb15bf836e41c788d709b852004200cd88f2
Author: Jonas Ådahl <jadahl gmail com>
Date:   Fri Apr 7 23:41:23 2017 +0800

    monitor-manager: Check active monitors when looking for logical monitor
    
    An inactive monitor will not be assigned to a logical monitor, so don't
    try to match against those. This avoids a dereferencing a NULL when the
    main output of an inactive monitor doesn't have an assigned CRTC.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=777732

 src/backends/meta-monitor-manager.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/backends/meta-monitor-manager.c b/src/backends/meta-monitor-manager.c
index 5657963..6aa997d 100644
--- a/src/backends/meta-monitor-manager.c
+++ b/src/backends/meta-monitor-manager.c
@@ -2950,7 +2950,8 @@ meta_monitor_manager_get_monitor_for_connector (MetaMonitorManager *manager,
     {
       MetaMonitor *monitor = l->data;
 
-      if (g_str_equal (connector, meta_monitor_get_connector (monitor)))
+      if (meta_monitor_is_active (monitor) &&
+          g_str_equal (connector, meta_monitor_get_connector (monitor)))
         {
           MetaOutput *main_output = meta_monitor_get_main_output (monitor);