Re: Redisplay issues with 'space' display properties on overlays

[Eli Zaretskii]

> From: dalanicolai <dalanicolai@gmail.com>
> Date: Sat, 16 Apr 2022 20:32:52 +0200
> Cc: Emacs Devel <emacs-devel@gnu.org>
> 
> Or actually simpler, for the first question, with pdf-tools installed,
> - first load pdf-scroll.el (after first setting the path to papyrus.el at the 
> beginning
> of the file)
> - open some pdf and scroll down/up a few pages
> - now split the buffer (the page in the second window does not display)
> - then do `M-: (print "test"), and 'hide' the echo area by pressing `esc`
> Now the page will display.
> 
> So my question is, which 'action' is responsible for getting that page 
> displayed

In general, when you enter the echo area, Emacs performs a more
thorough redisplay than when you don't.  Maybe that is what you are
experiencing.  But that's a guess.