These folder names are obviously special to the internal operation of maildir.  But the user doesn't know that, and if they attempt to create a folder with one of those names in a maildir resource (which is the preferred format for Local Folders) the creation fails with no error message or any other indication why.

This only seems to happen if the folder is being created in an empty folder (one that contains no items), or only subfolders.


Reproducible: Always

Steps to Reproduce:

1.  In either kmail or akonadiconsole, go to or create a new empty folder which is a maildir resource.

2.  From the context menu, click "New Folder".

3.  Enter one of the names "cur", "new" or "tmp" (without the quotes of course).

Actual Results:  
No subfolder is created.  No error message is shown.

If the original folder had no subfolders, then a "+" expansion indicator flashes briefly in the folder tree and then disappears again.


Expected Results:  
Either a subfolder of that name should be created, or if this is not possible due to internal limitations then an appropriate error message should be shown.