bug#47024: 28.0.50; [feature/native-comp] Warnings from async compilations truncated

[Eli Zaretskii]

> From: Andrea Corallo <akrl@sdf.org>
> Cc: 47024@debbugs.gnu.org
> Date: Tue, 09 Mar 2021 20:37:57 +0000
> 
> >   Warning (comp): seq.el:396:16: Warning: `seq-contains' is an obsolete 
> > generic function (as of Disable showing Disable logging
> >
> > Note the truncation after "(as of".
> >
> > Why does this happen? can it be fixed?
> 
> ATM we capture each Warning (or error) with the following regexp:
> "^.*+?\\(?:Error\\|Warning\\): .*$"
> 
> So I expect we match the full line (if is a multi line diagnostic we'll
> loose what's following).

The message comes from a sub-process, right?  Could it be that we
match prematurely, when only part of the text was received?