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Re: SVG hack for display engine

From: Alexander Adolf
Subject: Re: SVG hack for display engine
Date: Tue, 16 Nov 2021 15:08:00 +0100


Please don’t restrict your deliberations to pop-ups; that would be way too 
narrow a scope. Think of tables with different size faces in lines, rows, or 
even individual cells. Our tables using variable pitch fonts. Then, there other 
day, there was a discussion on this very list, about “universal tab stops” when 
using variable pitch fonts. 

All of these, and probably many more, use cases would be enabled by an SVG 
based display engine. 


> On 16. Nov 2021, at 13:56, Eli Zaretskii <eliz@gnu.org> wrote:
>> From: Anand Tamariya <atamariya@gmail.com>
>> Date: Tue, 16 Nov 2021 08:31:24 +0530
>> Cc: Emacs Devel <emacs-devel@gnu.org>
>> Do you notice the popup in the top window in the image attached in OP? It 
>> has clean lines over buffer
>> content with mixed (fixed + variable pitch) fonts. Is it possible to have 
>> that in graphical Emacs? Precise
>> positioning of popups can open up graphical Emacs to immense possibilities 
>> like feature filled tooltips, inline
>> completion popup, multi-column layouts, watermarks etc.  
> Why would it be impossible to implement something like that without
> changing the current basic display code?  IOW, what does the SVG
> enable, technically, that cannot be done with the current display and
> prevents implementation of such popups?

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