[gnome-panel] libgnome-panel: use idle to emit size-hints-changed signal

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 4cb91231795b472f2fd060109ad8b6d7ce71ce5e
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Tue Nov 1 19:30:24 2016 +0200

    libgnome-panel: use idle to emit size-hints-changed signal
    
    To make sure that we don't call gtk_widget_queue_resize() from
    GtkWidgetClass::size_allocate.

 libgnome-panel/gp-applet.c |   43 +++++++++++++++++++++++++++++++++++++++++--
 1 files changed, 41 insertions(+), 2 deletions(-)
---
diff --git a/libgnome-panel/gp-applet.c b/libgnome-panel/gp-applet.c
index 607fcc9..bb473e0 100644
--- a/libgnome-panel/gp-applet.c
+++ b/libgnome-panel/gp-applet.c
@@ -69,6 +69,8 @@ typedef struct
 
   GpAppletFlags       flags;
   GpSizeHints        *size_hints;
+
+  guint               size_hints_idle;
 } GpAppletPrivate;
 
 enum
@@ -102,6 +104,37 @@ static guint signals[LAST_SIGNAL] = { 0 };
 
 G_DEFINE_TYPE_WITH_PRIVATE (GpApplet, gp_applet, GTK_TYPE_EVENT_BOX)
 
+static gboolean
+emit_size_hints_changed_cb (gpointer user_data)
+{
+  GpApplet *applet;
+  GpAppletPrivate *priv;
+
+  applet = GP_APPLET (user_data);
+  priv = gp_applet_get_instance_private (applet);
+
+  priv->size_hints_idle = 0;
+  g_signal_emit (applet, signals[SIZE_HINTS_CHANGED], 0);
+
+  return G_SOURCE_REMOVE;
+}
+
+static void
+emit_size_hints_changed (GpApplet *applet)
+{
+  GpAppletPrivate *priv;
+  const gchar *name;
+
+  priv = gp_applet_get_instance_private (applet);
+  if (priv->size_hints_idle != 0)
+    return;
+
+  priv->size_hints_idle = g_idle_add (emit_size_hints_changed_cb, applet);
+
+  name = "[libgnome-panel] emit_size_hints_changed_cb";
+  g_source_set_name_by_id (priv->size_hints_idle, name);
+}
+
 static void
 gp_size_hints_free (gpointer data)
 {
@@ -166,6 +199,12 @@ gp_applet_dispose (GObject *object)
   g_clear_object (&priv->builder);
   g_clear_object (&priv->action_group);
 
+  if (priv->size_hints_idle != 0)
+    {
+      g_source_remove (priv->size_hints_idle);
+      priv->size_hints_idle = 0;
+    }
+
   G_OBJECT_CLASS (gp_applet_parent_class)->dispose (object);
 }
 
@@ -742,7 +781,7 @@ gp_applet_set_size_hints (GpApplet   *applet,
   if (!size_hints || n_elements == 0)
     {
       g_clear_pointer (&priv->size_hints, gp_size_hints_free);
-      g_signal_emit (applet, signals[SIZE_HINTS_CHANGED], 0);
+      emit_size_hints_changed (applet);
 
       return;
     }
@@ -767,7 +806,7 @@ gp_applet_set_size_hints (GpApplet   *applet,
   for (i = 0; i < n_elements; i++)
     priv->size_hints->size_hints[i] = size_hints[i] + base_size;
 
-  g_signal_emit (applet, signals[SIZE_HINTS_CHANGED], 0);
+  emit_size_hints_changed (applet);
 }
 
 /**