Things like current_directory, option_position, window_size, window_maximized etc are saved in the configuration file $XDG_CONFIG_HOME/MusicBrainz/Picard.conf instead of a more fitting place for non-essential temporary data (i.e. $XDG_CACHE_HOME/MusicBrainz/Picard.windows).

I do know this is not a specified part of the xdg-specification ( see for example http://lists.freedesktop.org/archives/xdg/2009-January/010140.html ) but it would be easier to share the same settings across multiple computers and see which configuration settings (you know, for things that actually matters, like renaming settings or tagging options) without the dating being "polluted" by window movements.

(Sorry if this is posted in the wrong categories, and I tried to search for similiar proposals, but failed).