I believe the variable `overlay-arrow-position' should
automatically become buffer-local whenever it is set.
It appears that Gnus fails to do this manually, instead
ending up setting the global value to a marker that refers
to the Gnus summary buffer, which doesn't make sense.
In fact, I see no reason to ever set the global value of
this variable. In any case, it should not be the default.
I recently noticed when adding an overlay arrow to rcirc that making
it `overlay-arrow-position' buffer local *does* work (you can get an
arrow in multiple buffers), even though (elisp)Overlay Arrow says:
- Variable: overlay-arrow-position
[...]
The overlay string is displayed only in the buffer that this marker
points into. Thus, only one buffer can have an overlay arrow at
any given time.
Which I think was true in 21.
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