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

[Robert Pluim]

>>>>> On Sat, 09 Oct 2021 13:10:57 +0200, Lars Ingebrigtsen <larsi@gnus.org> 
>>>>> said:

    Lars> Robert Pluim <rpluim@gmail.com> writes:
    >> I see you did that with 'after-change-functions'. Would a
    >> 'pre-yank-hook' be a useful addition to Emacs? I often yank output
    >> from badly behaved programs, and having a buffer-local hook to replace
    >> non-breaking-spaces and the like before insertion would be useful.

    Lars> There's `filter-buffer-substring' to do it from the other side...  
But I
    Lars> see now that I could just have set `yank-excluded-properties' to t in
    Lars> this mode to get the same effect as the `after-change-functions'.  
I'll
    Lars> adjust.

Doesnʼt `filter-buffer-substring' only work if Iʼm yanking from one
buffer to another? What if Iʼm yanking the X selection?

Robert
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