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

[Robert Pluim]

>>>>> On Mon, 11 Oct 2021 11:14:07 +0200, Kévin Le Gouguec 
>>>>> <kevin.legouguec@gmail.com> said:

    Kévin> Lars Ingebrigtsen <larsi@gnus.org> writes:
    >> Richard Stallman <rms@gnu.org> writes:
    >> 
    >>> M-x poverty-mode and M-x vow-of-poverty-mode
    >>> can complete from only 2 or 3 characters.
    >>> Likewise M-x no-properties-mode.
    >> 
    >> It also removed overlays and local variables, so it's not all about text
    >> properties...

    Kévin> Maybe the name should emphasize the _lack_ of any features 
whatsoever,
    Kévin> rather than the _removal_ of features?  E.g. void-mode, null-mode,
    Kévin> nil-mode, empty-mode, bare-mode, plain-mode?

ascetic-mode, austere-mode, thomas-à-becket-mode?

Robert
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