Re: highlight-indent-guides in display engine

[Keith David Bershatsky]

I forgot to cc Emacs Devel ...

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> Subject: 
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> Re: highlight-indent-guides in display engine
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> Date: 
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> Sun, 07 Jul 2019 10:48:51 -0700
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> I would suggest devising a method capable of intersecting characters, e,g.,
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> https://www.lawlist.com/images/22873_17684_light_dark_backgrounds.png
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> Using features 17684/22873, Emacs can quickly generate up to three lines that 
> are capable of intersecting characters ...  The current draft patch is version 
> 021.004 [06/29/2019]:
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> https://debbugs.gnu.org/cgi/bugreport.cgi?bug=22873#155
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> Using features 17684/22873, I have not run any tests to see how many vertical 
> lines could be drawn before there is an appreciable performance hit.  The 
> current design only redraws what has changed since the previous redisplay, so 
> it may be possible to draw several vertical lines without any performance hit 
> at all ...
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> One idea that I have not tried would be to use a thin window like a scroll bar 
> window to draw a vertical line ...
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