[metacity] window: add shaded property

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 5d5f8d652ed69cdf932844aeaa03bc0ac243069c
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Tue Oct 1 15:23:48 2019 +0300

    window: add shaded property
    
    Add shaded property to allow compositor listen for change
    notifications.

 src/core/window.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)
---
diff --git a/src/core/window.c b/src/core/window.c
index 695f7c3b..efe58755 100644
--- a/src/core/window.c
+++ b/src/core/window.c
@@ -137,6 +137,7 @@ enum
 
   PROP_APPEARS_FOCUSED,
   PROP_DECORATED,
+  PROP_SHADED,
 
   LAST_PROP
 };
@@ -3098,6 +3099,8 @@ meta_window_shade (MetaWindow  *window,
       meta_window_focus (window, timestamp);
 
       set_net_wm_state (window);
+
+      g_object_notify_by_pspec (G_OBJECT (window), properties[PROP_SHADED]);
     }
 }
 
@@ -3123,6 +3126,8 @@ meta_window_unshade (MetaWindow  *window,
       meta_window_focus (window, timestamp);
 
       set_net_wm_state (window);
+
+      g_object_notify_by_pspec (G_OBJECT (window), properties[PROP_SHADED]);
     }
 }
 
@@ -9294,6 +9299,10 @@ meta_window_get_property (GObject    *object,
         g_value_set_boolean (value, window->decorated);
         break;
 
+      case PROP_SHADED:
+        g_value_set_boolean (value, window->shaded);
+        break;
+
       default:
         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
         break;
@@ -9311,6 +9320,10 @@ install_properties (GObjectClass *object_class)
     g_param_spec_boolean ("decorated", "decorated", "decorated",
                           TRUE, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
 
+  properties[PROP_SHADED] =
+    g_param_spec_boolean ("shaded", "shaded", "shaded",
+                          FALSE, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
+
   g_object_class_install_properties (object_class, LAST_PROP, properties);
 }