[gnome-photos] preview-nav-buttons: Remove auto_hide_id during destruction

[Debarshi Ray <debarshir src gnome org>]

commit ab7aff624725ee6c736dd0cfd978d690f1dce976
Author: Debarshi Ray <debarshir gnome org>
Date:   Fri Mar 18 19:51:38 2016 +0100

    preview-nav-buttons: Remove auto_hide_id during destruction
    
    https://bugzilla.gnome.org/show_bug.cgi?id=763908

 src/photos-preview-nav-buttons.c |    8 +++-----
 1 files changed, 3 insertions(+), 5 deletions(-)
---
diff --git a/src/photos-preview-nav-buttons.c b/src/photos-preview-nav-buttons.c
index 30b5919..166e8d8 100644
--- a/src/photos-preview-nav-buttons.c
+++ b/src/photos-preview-nav-buttons.c
@@ -219,11 +219,7 @@ static void
 photos_preview_nav_buttons_queue_auto_hide (PhotosPreviewNavButtons *self)
 {
   photos_preview_nav_buttons_unqueue_auto_hide (self);
-  self->auto_hide_id = g_timeout_add_seconds_full (G_PRIORITY_DEFAULT,
-                                                   2,
-                                                   (GSourceFunc) photos_preview_nav_buttons_auto_hide,
-                                                   g_object_ref (self),
-                                                   g_object_unref);
+  self->auto_hide_id = g_timeout_add_seconds (2, (GSourceFunc) photos_preview_nav_buttons_auto_hide, self);
 }
 
 
@@ -355,6 +351,8 @@ photos_preview_nav_buttons_dispose (GObject *object)
 {
   PhotosPreviewNavButtons *self = PHOTOS_PREVIEW_NAV_BUTTONS (object);
 
+  photos_preview_nav_buttons_unqueue_auto_hide (self);
+
   g_clear_object (&self->tap_gesture);
   g_clear_object (&self->model);
   g_clear_object (&self->next_widget);