kupfer doesn't follow symlinks when saving the configuration file

[Benjamin Albrecht]

I manage my kupfer.cfg alongside other dotfiles with homeshick. [1]

When changing settings using the preferences menu, the symbolic link that points from ~/.config/kupfer/kupfer.cfg to the file in my dotfiles repository gets overwritten by the newly saved configuration file

As a result, the updated settings don't get written to the dotfiles repository.

Attached is a patch, that fixes this behaviour, simply by calling os.path.realpath() [2] on the path of the config file before renaming the temporary file.

[1] https://github.com/andsens/homeshick
[2] https://docs.python.org/2/library/os.path.html#os.path.realpath