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

[Lars Ingebrigtsen]

Richard Stallman <rms@gnu.org> writes:

> I see the usefulness of a command to remove such things from the
> buffer, but I don't think it fits the Emacs concept of "mode".  It
> changes the contents of the buffer.
>
> I suggest renaming it to something like `clean-buffer'.

It's a mode -- it continues to remove text properties from text you yank
into it.

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