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

From: Richard Stallman <[email-masked]>
Date: Mon, 11 Oct 2021 17:15:48 -0400

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  > It also removed overlays and local variables, so it's not all about text
  > properties...

Changing major mode always eliminates local variables, so there is no need
to regard that as a feature of this particular mode.

Also, normally overlays are created by modes, so removing them may also be
due to changing the mode, not a feature of this particular mode.

-- 
Dr Richard Stallman (https://stallman.org)
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)