[mutter] monitor-manager: Don't apply unneeded orientation changes

[Marge Bot <marge-bot src gnome org>]

commit 2289f56112a95b5a30853d986e82814ecbe88433
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Fri May 1 15:34:25 2020 +0200

    monitor-manager: Don't apply unneeded orientation changes
    
    There's no need to ensure monitor orientation changes if the wanted
    orientation is matching the current one.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1233>

 src/backends/meta-monitor-manager.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)
---
diff --git a/src/backends/meta-monitor-manager.c b/src/backends/meta-monitor-manager.c
index ce02103f15..cffa8922bd 100644
--- a/src/backends/meta-monitor-manager.c
+++ b/src/backends/meta-monitor-manager.c
@@ -811,6 +811,14 @@ handle_orientation_change (MetaOrientationManager *orientation_manager,
   MetaMonitorTransform transform;
   GError *error = NULL;
   MetaMonitorsConfig *config;
+  MetaMonitor *laptop_panel;
+  MetaLogicalMonitor *laptop_logical_monitor;
+
+  laptop_panel = meta_monitor_manager_get_laptop_panel (manager);
+  g_return_if_fail (laptop_panel);
+
+  if (!meta_monitor_is_active (laptop_panel))
+    return;
 
   switch (meta_orientation_manager_get_orientation (orientation_manager))
     {
@@ -832,6 +840,10 @@ handle_orientation_change (MetaOrientationManager *orientation_manager,
       return;
     }
 
+  laptop_logical_monitor = meta_monitor_get_logical_monitor (laptop_panel);
+  if (meta_logical_monitor_get_transform (laptop_logical_monitor) == transform)
+    return;
+
   config =
     meta_monitor_config_manager_create_for_orientation (manager->config_manager,
                                                         transform);