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bug#13400: 23.4; overlapping process filter calls

From: Noam Postavsky
Subject: bug#13400: 23.4; overlapping process filter calls
Date: Wed, 07 Aug 2019 23:37:29 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.2.90 (gnu/linux)

Stefan Monnier <address@hidden> writes:

> I'm pretty sure that while there might be use-cases for recursive
> invocation of filters, this is a very exceptional situation and the
> average programmer will not expect it and would be stumped if/when
> it happens.
> So the default should be to prevent it, with maybe some way to override
> it to cater to the exceptional case where recursive invocation
> is to be allowed.
> I think we could do that by setting a property on process object during
> filter invocation to postpone further filter invocations, and then the
> process filter could locally unset this property if it wants to allow
> recursive invocations.

Yeah, I suppose that would probably be better.  Although then we have
some potential weird edge cases like what happens when when changing the
property during a recursive invocation.

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