all: Name more idles and timeouts

Following up from 438cd857c4,
name more timeouts and idles.

The original grep was missing checking for gdk_threads_add_*()
functions (at least for some of the files).

https://bugzilla.gnome.org/show_bug.cgi?id=726870

gtk/gtkprintunixdialog.c

@@ -1927,6 +1927,7 @@ schedule_idle_mark_conflicts (GtkPrintUnixDialog *dialog)
 
   priv->mark_conflicts_id = gdk_threads_add_idle (mark_conflicts_callback,
                                         dialog);
+  g_source_set_name_by_id (priv->mark_conflicts_id, "[gtk+] mark_conflicts_callback");
 }
 
 static void