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

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> I think this is a corner use case, and if there's no easy way of doing
> something better with it, we shouldn't do anything.

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.

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