If I change the categories on an article but do nothing else, saving it doesn't mark them as saved so if I try to quit OLW or open a different article, it tells me I have unsaved changes.
This happened with WLW as well.
newbie on OLW code here but will try to look at this issue.
Might be worth checking if this is still actually an issue, it could have been fixed by #228
Checked #228. It is a different issue. I did PR #252 to fix this.