Patch submitted. Did refactoring to rename all instances of folder's show_expanded to showexpanded. Also added upgrade code to rename database field and site config setting.
One concern that I am unsure of how to handle is what to do with backup files that have the old show_expanded value. Right now, I believe, the code will just use the site config setting, if it doesn't find the showexpanded value in the backup file.
Since the code with the old show_expanded value was in the ALPHA/BETA status, do we not need to worry about it?