[evince] window-title: Keep a weak ref on the document

[Carlos Garcia Campos <carlosgc src gnome org>]

commit 0aafd8809a5464aef05e73c33e501cea0b413059
Author: Carlos Garcia Campos <carlosgc gnome org>
Date:   Sat Sep 27 12:29:48 2014 +0200

    window-title: Keep a weak ref on the document
    
    To cleanup the pointer and doc_title when the document is destroyed.
    Fixes a crash when a new document is added to the window.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=737365

 shell/ev-window-title.c |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)
---
diff --git a/shell/ev-window-title.c b/shell/ev-window-title.c
index b442717..c09da93 100644
--- a/shell/ev-window-title.c
+++ b/shell/ev-window-title.c
@@ -190,6 +190,14 @@ ev_window_title_set_type (EvWindowTitle *window_title, EvWindowTitleType type)
        ev_window_title_update (window_title);
 }
 
+static void
+document_destroyed_cb (EvWindowTitle *window_title,
+                       GObject       *document)
+{
+        window_title->document = NULL;
+        g_clear_pointer (&window_title->doc_title, g_free);
+}
+
 void
 ev_window_title_set_document (EvWindowTitle *window_title,
                              EvDocument    *document)
@@ -197,7 +205,10 @@ ev_window_title_set_document (EvWindowTitle *window_title,
         if (window_title->document == document)
                 return;
 
+        if (window_title->document)
+                g_object_weak_unref (G_OBJECT (window_title->document), (GWeakNotify)document_destroyed_cb, 
window_title);
        window_title->document = document;
+        g_object_weak_ref (G_OBJECT (window_title->document), (GWeakNotify)document_destroyed_cb, 
window_title);
         g_clear_pointer (&window_title->doc_title, g_free);
 
        if (window_title->document != NULL) {
@@ -237,6 +248,8 @@ ev_window_title_set_uri (EvWindowTitle *window_title,
 void
 ev_window_title_free (EvWindowTitle *window_title)
 {
+        if (window_title->document)
+                g_object_weak_unref (G_OBJECT (window_title->document), (GWeakNotify)document_destroyed_cb, 
window_title);
         g_free (window_title->doc_title);
        g_free (window_title->uri);
        g_free (window_title);