[GTKUI] Fix treeview columns not saving

deluge/ui/gtkui/gtkui.py

@@ -263,6 +263,8 @@ class GtkUI(object):
 
     def pre_shutdown(self, *args, **kwargs):
         """Modal dialogs can prevent the application exiting so destroy mainwindow"""
+        # Ensure columns state is saved
+        self.torrentview.save_state()
         self.mainwindow.window.destroy()
 
     def print_rpc_stats(self):

deluge/ui/gtkui/torrentview.py

@@ -358,18 +358,19 @@ class TorrentView(ListView, component.Component):
 
     def shutdown(self):
         """Called when GtkUi is exiting"""
-        if self.window.visible():
         self.save_state()
 
     def save_state(self):
         """
         Saves the state of the torrent view.
         """
+        if self.window.visible():
             ListView.save_state(self, "torrentview.state")
 
     def remove_column(self, header):
         """Removes the column with the name 'header' from the torrentview"""
         self.save_state()
+        if self.window.visible():
             ListView.remove_column(self, header)
 
     def set_filter(self, filter_dict):