Remove cancelled and failed downloads on exit

Cancelled and failed downloads should have their
partial download files removed when gPodder is
closed, while all other (non-finished) files should
be paused to be resumed in the next session.

src/gpodder/gui.py

@@ -2176,8 +2176,11 @@ class gPodder(GladeWidget, dbus.service.Object):
             else:
                 self.show_message(_('Please check your permissions and free disk space.'), _('Error saving podcast list'))
 
-        self.download_status_manager.pause_all_downloads()
         self.gPodder.hide()
+
+        # Notify all tasks to to carry out any clean-up actions
+        self.download_status_manager.tell_all_tasks_to_quit()
+
         while gtk.events_pending():
             gtk.main_iteration(False)
 

src/gpodder/services.py

@@ -346,11 +346,17 @@ class DownloadStatusManager(object):
     def register_task(self, task):
         util.idle_add(self.__add_new_task, task)
 
-    def pause_all_downloads(self):
+    def tell_all_tasks_to_quit(self):
         for row in self.__model:
             task = row[DownloadStatusManager.C_TASK]
             if task is not None:
-                task.status = task.PAUSED
+                # Pause currently-running (and queued) downloads
+                if task.status in (task.QUEUED, task.DOWNLOADING):
+                    task.status = task.PAUSED
+
+                # Delete cancelled and failed downloads
+                if task.status in (task.CANCELLED, task.FAILED):
+                    task.removed_from_list()
 
     def are_downloads_in_progress(self):
         """