Warn when closing modified buffers

[mynuta]

Normally emacs will ask for confirmation if one tries to close a buffer that hasn't been saved. I imagine that this feature is dependent on major mode, because Mediawiki buffers don't do that.

What would it take to implement this? mediawiki-reload could also benefit from it, since it currently overrides everything, including undo history.

Also, is there a way to make a buffer's content persist in my desktop session? It doesn't have to reestablish sessions automatically, just the text.

[hexmode]

Could you please open a separate issue for the desktop persistence?