bug#30204: 27.0.50; Changing major mode resets non-default invisibility spec

[Lars Ingebrigtsen]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> Perhaps we should have a mode that even more fundamental than
> fundamental-mode, that does a real cleanup of the buffer (removes all
> text properties, overlays, etc), and just document that there are some
> artefacts that may remain otherwise when changing modes?
>
> We could call it...  fundamentalist-mode.

I've now added this to Emacs 29 under the name `clean-mode'.

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