[mutter/gnome-3-26] monitor-manager: Refuse to activate closed laptop panels

[Rui Matos <rtcm src gnome org>]

commit ed989a2989fbfe540f3b80f52a0828983ddbc003
Author: Rui Matos <tiagomatos gmail com>
Date:   Tue Nov 14 18:10:55 2017 +0100

    monitor-manager: Refuse to activate closed laptop panels
    
    There's no good reason to allow this and it allows g-c-c to properly
    show that such a configuration doesn't work.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=790336

 src/backends/meta-monitor-manager.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/src/backends/meta-monitor-manager.c b/src/backends/meta-monitor-manager.c
index f2ad3f3..33ef0ef 100644
--- a/src/backends/meta-monitor-manager.c
+++ b/src/backends/meta-monitor-manager.c
@@ -1522,6 +1522,13 @@ meta_monitor_manager_is_config_applicable (MetaMonitorManager *manager,
               return FALSE;
             }
 
+          if (meta_monitor_is_laptop_panel (monitor) &&
+              meta_monitor_manager_is_lid_closed (manager))
+            {
+              g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
+                           "Refusing to activate a closed laptop panel");
+              return FALSE;
+            }
         }
     }