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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Redisplay issues with 'space' display properties on overlays
Date: Sat, 16 Apr 2022 22:18:46 +0300
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 (message from dalanicolai on Sat, 16 Apr 2022 21:16:18 +0200)
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> From: dalanicolai <dalanicolai@gmail.com>
> Date: Sat, 16 Apr 2022 21:16:18 +0200
> Cc: Emacs Devel <emacs-devel@gnu.org>
> 
>  I guess I don't understand what you mean by "window does not get
>  redisplayed".  because I see no difference on display before and after
>  I do 'M-: (print "test")'.  Maybe I didn't follow the recipe to the
>  letter?
> 
> Did you scroll forward a few pages before splitting the window? 

Yes.