monitor-manager: only reuse initial-config if monitor topology matches startup

Right now we try to apply the current monitor config when a new
monitor is attached.  The current config obviously doesn't include the
new monitor, so the new monitor isn't lit up.

The only reason we apply the current config at all is to handle the
startup case:  We want to reuse the config set in Xorg when first
logging in.

This commit changes the code to look at the *initial config* instead
of the current config, and only if the new monitor topology matches
the start up topology.

3 files changed, 31 insertions, 7 deletions

diff --git a/src/backends/meta-monitor-config-manager.c b/src/backends/meta-monitor-config-manager.c
index 585ee7034..1ad342a44 100644
--- a/src/backends/meta-monitor-config-manager.c
+++ b/src/backends/meta-monitor-config-manager.c
@@ -40,6 +40,7 @@ struct _MetaMonitorConfigManager
   MetaMonitorConfigStore *config_store;
 
   MetaMonitorsConfig *current_config;
+  MetaMonitorsConfig *initial_config;
   GQueue config_history;
 };
 
@@ -579,9 +580,10 @@ create_logical_monitor_config_from_output (MetaMonitorManager           *monitor
 }
 
 MetaMonitorsConfig *
-meta_monitor_config_manager_create_current (MetaMonitorConfigManager *config_manager)
+meta_monitor_config_manager_create_initial (MetaMonitorConfigManager *config_manager)
 {
   MetaMonitorManager *monitor_manager = config_manager->monitor_manager;
+  MetaMonitorsConfig *initial_config;
   GList *logical_monitor_configs;
   MetaMonitor *primary_monitor;
   MetaLogicalMonitorLayoutMode layout_mode;
@@ -589,6 +591,9 @@ meta_monitor_config_manager_create_current (MetaMonitorConfigManager *config_man
   GList *monitors;
   GList *l;
 
+  if (config_manager->initial_config != NULL)
+    return g_object_ref (config_manager->initial_config);
+
   if (meta_monitor_config_store_get_config_count (config_manager->config_store) > 0)
     return NULL;
 
@@ -630,10 +635,14 @@ meta_monitor_config_manager_create_current (MetaMonitorConfigManager *config_man
                                                logical_monitor_config);
     }
 
-  return meta_monitors_config_new (monitor_manager,
-                                   logical_monitor_configs,
-                                   layout_mode,
-                                   META_MONITORS_CONFIG_FLAG_NONE);
+  initial_config = meta_monitors_config_new (monitor_manager,
+                                             logical_monitor_configs,
+                                             layout_mode,
+                                             META_MONITORS_CONFIG_FLAG_NONE);
+
+  config_manager->initial_config = g_object_ref (initial_config);
+
+  return initial_config;
 }
 
 MetaMonitorsConfig *
@@ -1162,6 +1171,7 @@ meta_monitor_config_manager_dispose (GObject *object)
     META_MONITOR_CONFIG_MANAGER (object);
 
   g_clear_object (&config_manager->current_config);
+  g_clear_object (&config_manager->initial_config);
   meta_monitor_config_manager_clear_history (config_manager);
 
   G_OBJECT_CLASS (meta_monitor_config_manager_parent_class)->dispose (object);
diff --git a/src/backends/meta-monitor-config-manager.h b/src/backends/meta-monitor-config-manager.h
index c36df38e6..29ef8f8ce 100644
--- a/src/backends/meta-monitor-config-manager.h
+++ b/src/backends/meta-monitor-config-manager.h
@@ -87,7 +87,7 @@ gboolean meta_monitor_config_manager_assign (MetaMonitorManager *manager,
 
 MetaMonitorsConfig * meta_monitor_config_manager_get_stored (MetaMonitorConfigManager *config_manager);
 
-MetaMonitorsConfig * meta_monitor_config_manager_create_current (MetaMonitorConfigManager *config_manager);
+MetaMonitorsConfig * meta_monitor_config_manager_create_initial (MetaMonitorConfigManager *config_manager);
 MetaMonitorsConfig * meta_monitor_config_manager_create_linear (MetaMonitorConfigManager *config_manager);
 
 MetaMonitorsConfig * meta_monitor_config_manager_create_fallback (MetaMonitorConfigManager *config_manager);
diff --git a/src/backends/meta-monitor-manager.c b/src/backends/meta-monitor-manager.c
index 4503eb841..f7ada0136 100644
--- a/src/backends/meta-monitor-manager.c
+++ b/src/backends/meta-monitor-manager.c
@@ -496,9 +496,11 @@ should_use_stored_config (MetaMonitorManager *manager)
 MetaMonitorsConfig *
 meta_monitor_manager_ensure_configured (MetaMonitorManager *manager)
 {
+  g_autoptr (MetaMonitorsConfig) initial_config = NULL;
   MetaMonitorsConfig *config = NULL;
   GError *error = NULL;
   gboolean use_stored_config;
+  MetaMonitorsConfigKey *current_state_key;
   MetaMonitorsConfigMethod method;
   MetaMonitorsConfigMethod fallback_method =
     META_MONITORS_CONFIG_METHOD_TEMPORARY;
@@ -509,6 +511,18 @@ meta_monitor_manager_ensure_configured (MetaMonitorManager *manager)
   else
     method = META_MONITORS_CONFIG_METHOD_TEMPORARY;
 
+  initial_config = meta_monitor_config_manager_create_initial (manager->config_manager);
+
+  if (initial_config)
+    {
+      current_state_key = meta_create_monitors_config_key_for_current_state (manager);
+
+      /* don't ever reuse initial configuration, if the monitor topology changed
+       */
+      if (current_state_key && !meta_monitors_config_key_equal (current_state_key, initial_config->key))
+        g_clear_object (&initial_config);
+    }
+
   if (use_stored_config)
     {
       config = meta_monitor_config_manager_get_stored (manager->config_manager);
@@ -576,7 +590,7 @@ meta_monitor_manager_ensure_configured (MetaMonitorManager *manager)
       g_clear_object (&config);
     }
 
-  config = meta_monitor_config_manager_create_current (manager->config_manager);
+  config = g_steal_pointer (&initial_config);
   if (config)
     {
       if (!meta_monitor_manager_apply_monitors_config (manager,