bug#34138: 27.0.50; Delayed display of PDF file images

[Eli Zaretskii]

> From: Stephen Berman <stephen.berman@gmx.net>
> Date: Sun, 20 Jan 2019 15:55:01 +0100
> Cc: 34138@debbugs.gnu.org, Andreas Politz <politza@hochschule-trier.de>,
>       Tassilo Horn <tsdh@gnu.org>
> 
> > It seems that 'doc-view-new-window-function' fails in some way.  This
> > time I have to CC Tassilo.  Maybe he has a clue.
> 
> I stepped through that function with Edebug but that failed to reproduce
> the problem, instead, as expected, the "Welcome to DocView!"  message
> was briefly shown in the buffer and then then image.

I think that's expected, since you said that pressing a key ends the
delay immediately.  And stepping with Edebug requires that you type
keys.

If you configure blink-cursor-mode to never stop blinking, does the
problem go away, per chance?