[gnote] Fix crash when quiting

[Aurimas Černius <aurimasc src gnome org>]

commit e8997f6a05437b9bc08831ef7155235dd5b9cb12
Author: Aurimas Černius <aurisc4 gmail com>
Date:   Sun Jul 12 14:52:28 2015 +0300

    Fix crash when quiting
    
    Fixes Bug 751427

 src/gnote.cpp |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/src/gnote.cpp b/src/gnote.cpp
index e6c8a95..dce45e0 100644
--- a/src/gnote.cpp
+++ b/src/gnote.cpp
@@ -253,7 +253,13 @@ namespace gnote {
 
   void Gnote::on_quit_gnote_action(const Glib::VariantBase&)
   {
-    quit();
+    std::vector<Gtk::Window*> windows = Gtk::Window::list_toplevels();
+    FOREACH(Gtk::Window *window, windows) {
+      window->close();
+    }
+    if(is_background()) {
+      release();
+    }
   }
 
   void Gnote::on_preferences_response(int /*res*/)