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

From: Philipp Stephani <[email-masked]>
Date: Mon, 22 Jan 2018 20:42:00 +0000

Eli Zaretskii <[email-masked]> schrieb am Mo., 22. Jan. 2018 um 16:57 Uhr:

> > From: Philipp Stephani <[email-masked]>
> > Date: Mon, 22 Jan 2018 10:51:32 +0100
> >
> > C-x b *foo* RET
> > M-: (progn (add-to-invisibility-spec 'bar) (insert (propertize "foo"
> 'invisible 'foo)))
> >
> > Now "foo" is visible, as it should be.
> >
> > M-x fundamental-mode => "foo" becomes invisible, because
> > `kill-all-local-variables' has reset `buffer-invisibility-spec' to t.
> > This can be confusing for modes that use conditional invisibility
> > properties such as markdown-mode.
> > Probably `kill-all-local-variables' shouldn't blindly reset
> > `buffer-invisibility-spec', or maybe it should remove conditional
> > invisibility properties.
>
> Why can't you make buffer-invisibility-spec be a permanent-local
> variable in the cases where that is TRT?
>
>
Hmm, yes, that sounds like a good idea. Let me try that.