[gnome-flashback] monitor-manager: add a handle_orientation_change helper function

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 21ab7e8cd1deb1de4811ad71fda49e27a8bacc37
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sun Sep 12 21:47:12 2021 +0300

    monitor-manager: add a handle_orientation_change helper function
    
    Move the bulk of orientation_changed to a new handle_orientation_change
    helper function. This is a preparation patch for further orientation
    handling related changes.
    
    Based on mutter commit:
    https://gitlab.gnome.org/GNOME/mutter/-/commit/4c1220836331

 backends/gf-monitor-manager.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)
---
diff --git a/backends/gf-monitor-manager.c b/backends/gf-monitor-manager.c
index 074eddc..dbcc097 100644
--- a/backends/gf-monitor-manager.c
+++ b/backends/gf-monitor-manager.c
@@ -501,16 +501,13 @@ gf_monitor_manager_apply_monitors_config (GfMonitorManager        *manager,
 }
 
 static void
-orientation_changed (GfOrientationManager *orientation_manager,
-                     GfMonitorManager     *manager)
+handle_orientation_change (GfOrientationManager *orientation_manager,
+                           GfMonitorManager     *manager)
 {
   GfMonitorTransform transform;
   GError *error = NULL;
   GfMonitorsConfig *config;
 
-  if (!manager->panel_orientation_managed)
-    return;
-
   switch (gf_orientation_manager_get_orientation (orientation_manager))
     {
       case GF_ORIENTATION_NORMAL:
@@ -549,6 +546,16 @@ orientation_changed (GfOrientationManager *orientation_manager,
   g_object_unref (config);
 }
 
+static void
+orientation_changed (GfOrientationManager *orientation_manager,
+                     GfMonitorManager     *self)
+{
+  if (!self->panel_orientation_managed)
+    return;
+
+  handle_orientation_change (orientation_manager, self);
+}
+
 static void
 update_panel_orientation_managed (GfMonitorManager *self)
 {