bug#38561: 27.0.50; Feature request: expose buffer size setting for process filters

[Eli Zaretskii]

> Cc: 38561@debbugs.gnu.org
> From: Dmitry Gutov <dgutov@yandex.ru>
> Date: Sun, 22 Dec 2019 16:23:13 +0200
> 
> On 21.12.2019 20:25, Eli Zaretskii wrote:
> > Btw, my assumption was that the value will have to be changed from
> > default only in very rare situations.  If this is not the case, we
> > might indeed want that to be a parameter at process creation time (I
> > don't think we have process-local variables, do we?).
> 
> Could the process use the buffer-local value of this variable?

It didn't work for Ivan, I'm not yet sure why.  Feel free to
investigate.

> Or, alternatively, use the value this variable had at the point of 
> process's creation. Then the caller could just temporarily bind it.

That's impossible without saving the value in the process object.