Warn user before closing window with multiple tabs
Often while performing a directory comparison and I've just merged one of the differing files (in a new tab), I accidentally close the entire window instead of only the tab for the file that I just merged, inadvertently closing all other tabs and the directory comparison itself (which I haven't finished merging yet). It would be nice if a warning dialog came up when I try to close the entire window and there are multiple tabs open, similar to the behavior in Chrome (and other browsers). I'd be perfectly fine even if this were an opt-in behavior set in the preferences (i.e., off by default).