SqlCollectionLocation::moodFile() tries to replace the filename's extension with ".mood" (and prepend a '.') to get the Url of the moodfile.
But it does that *after* the filename has already been removed from the Url, so QUrl::fileName() gives an empty string and the end result is actually "/path/to/folder/." which depicts the containing folder.

As a result, when Amarok tries to delete the corresponding moodfile after a track is deleted, the whole folder gets deleted instead.

To fix this, save the filename in a temporary variable before removing it, and use that for generating the new filename.

BUG: 411760

Delete a track from the local collection (right-click->"Delete tracks" or "Move to trash").
Only the selected track gets deleted now, previously it deleted all other files in the containing folder as well.

Debug output I added locally confirms that the generated path is now as expected, i.e. "/path/to/folder/.xxx.mood" instead of "/path/to/folder/.".