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

[Eli Zaretskii]

> From: yyoncho <yyoncho@gmail.com>
> Date: Sat, 21 Dec 2019 21:30:15 +0200
> Cc: 38561@debbugs.gnu.org
> 
> When you create a process you provide a bunch of settings(e. g. 
> :connection-type, :filter, :no-query). Can we make another property for 
> the read max size? 

Thanks what I meant by process parameters.

I'd prefer to wait first and see how many use cases need this setting,
before we decide whether to provide it as a process attribute.