[mutter] monitor-manager: Update orientation based config when panel_orientation_managed changes

[Carlos Garnacho <carlosg src gnome org>]

commit 1b13f50582b3e12232f1f9bf1686e2238d6e0da9
Author: Hans de Goede <hdegoede redhat com>
Date:   Thu Oct 15 12:22:53 2020 +0200

    monitor-manager: Update orientation based config when panel_orientation_managed changes
    
    The orientation reported by the orientation_manager may have changed while
    panel_orientation_managed was false. So when panel_orientation_managed
    changes to true we should re-check the orientation.
    
    This fixes the orientation not being correct when e.g. taking a 360 degree
    hinges 2-in-1 in clamshell mode (so landscape orientation) and then folding
    it into tablet mode while holding it in portrait orientation.
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1506

 src/backends/meta-monitor-manager.c | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/src/backends/meta-monitor-manager.c b/src/backends/meta-monitor-manager.c
index 18aeddcd9c..0e2583b08a 100644
--- a/src/backends/meta-monitor-manager.c
+++ b/src/backends/meta-monitor-manager.c
@@ -785,6 +785,10 @@ update_panel_orientation_managed (MetaMonitorManager *manager)
 
   meta_dbus_display_config_set_panel_orientation_managed (manager->display_config,
                                                           manager->panel_orientation_managed);
+
+  /* The orientation may have changed while it was unmanaged */
+  if (panel_orientation_managed)
+    handle_orientation_change (orientation_manager, manager);
 }
 
 void