Folder names must not end in dots (bug 600)

On Windows, a folder name like "Abc..." is
saved as "Abc", and trying to create such a
folder name works, but the trailing dots are
removed. When trying to download files to such
a folder (while gPodder still believes the
folder has dots at the end), this won't work.

To fix this bug, don't allow trailing dots in
the folder name of podcasts by stripping them.

Thanks to Yves for reporting this bug.

src/gpodder/model.py

@@ -516,7 +516,11 @@ class PodcastChannel(PodcastModelObject):
         return self.db.load_episodes(self, factory=self.episode_factory)
 
     def find_unique_folder_name(self, foldername):
-        current_try = util.sanitize_filename(foldername, self.MAX_FOLDERNAME_LENGTH)
+        # Remove trailing dots to avoid errors on Windows (bug 600)
+        foldername = foldername.strip().rstrip('.')
+
+        current_try = util.sanitize_filename(foldername, \
+                self.MAX_FOLDERNAME_LENGTH)
         next_try_id = 2
 
         while True: