Bram Moolenaar wrote：
> Skywind wrote:
>
> > Bram Moolenaar wrote：
> >
> > > You can improve this a lot by changing:
> > >
> > > if ch_canread(ch)
> > > let text = ch_read(ch, {'timeout':0})
> > > caddexpr text
> > > cbottom
> > > endif
> > >
> > > To:
> > >
> > > if ch_canread(ch)
> > > while ch_canread(ch)
> > > let text = ch_read(ch, {'timeout':0})
> > > caddexpr text
> > > endwhile
> > > cbottom
> > > endif
> >
> > Yes, I intentionally do so to make reading really slower than writing.
> >
> > > But, you might still miss some messages if the job exits early.
> > >
> > > I suppose we will need to add an option to tell Vim that you will read
> > > the messages, not using a callback. I think this should do it:
> > >
> > > "drop" Specifies when to drop messages:
> > > "auto" When there is no callback to handle a message.
> > > The "close_cb" is also considered for this.
> > > "never" All messages will be kept.
> > >
> >
> > It's very nice if I can have the "drop" option in job_start !
>
> Should work with patch 8.0.0107. Took a bit of debugging to figure out
> why the channel was reported as being closed. I thought messages were
> being dropped somewhere, but it turned out to be a problem with
> ch_canread().
>
Finally, thanks very much :D
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