[gnome-builder] prefs: release extensions on destroy event

[Christian Hergert <chergert src gnome org>]

commit ca72147cb6b99feee5d4ae3b2059b7cc8492694c
Author: Christian Hergert <chergert redhat com>
Date:   Sun Sep 24 23:58:12 2017 -0700

    prefs: release extensions on destroy event
    
    These were getting leaked apparently.

 .../preferences/ide-preferences-perspective.c      |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)
---
diff --git a/src/libide/preferences/ide-preferences-perspective.c 
b/src/libide/preferences/ide-preferences-perspective.c
index f4f3873..e3a43a2 100644
--- a/src/libide/preferences/ide-preferences-perspective.c
+++ b/src/libide/preferences/ide-preferences-perspective.c
@@ -72,6 +72,16 @@ ide_preferences_perspective_extension_removed (PeasExtensionSet *set,
 }
 
 static void
+ide_preferences_perspective_destroy (GtkWidget *widget)
+{
+  IdePreferencesPerspective *self = (IdePreferencesPerspective *)widget;
+
+  g_clear_object (&self->extensions);
+
+  GTK_WIDGET_CLASS (ide_preferences_perspective_parent_class)->destroy (widget);
+}
+
+static void
 ide_preferences_perspective_constructed (GObject *object)
 {
   IdePreferencesPerspective *self = (IdePreferencesPerspective *)object;
@@ -103,8 +113,11 @@ static void
 ide_preferences_perspective_class_init (IdePreferencesPerspectiveClass *klass)
 {
   GObjectClass *object_class = G_OBJECT_CLASS (klass);
+  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
 
   object_class->constructed = ide_preferences_perspective_constructed;
+
+  widget_class->destroy = ide_preferences_perspective_destroy;
 }
 
 static void