from http://bugs.musicbrainz.org/ticket/3044

In PicardQt when browsing directories using the file browser, key presses do not respond as expected. At a collapsed directory, I expect that a right key press will expand and a left will collapse, which happens, on the current directory only. I expect if I have a left key press on a collapsed directory, that it will return the selection to the upper directory, and then allow for another left key press to collapse it. Also my expected action of the home key would be to bring the selection to the next highest directory, not the very top of the list with the first drive, in my case being drive A. I feel that it would be more efficient for file navigation. This could be solved by either changing the default key actions, or implementing a keyboard action editor, either via plugin or hardcode.