Re: How to make Emacs popular again: Use monospaced fonts less

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: larsi@gnus.org,  emacs-devel@gnu.org
> Date: Thu, 15 Oct 2020 10:21:39 -0400
> 
> Yes, we'd need somehow to walk back the glyph structure to find the
> pixel position of the start position of the element.
> 
> What I was trying to address is the issue of text properties being
> potentially split, so you can't really rely on
> 
>     (put-text-property START END 'width 50)
> 
> so I was thinking of instead doing something like
> 
>     (put-text-property (1- END) END 'relative-end-position (list START 50))
> 
> so when the redisplay sees this position, it would walk back the glyphs
> to find the nearest one corresponding to START, and then either truncate
> the last few glyphs to fit in a width of 50, or add some space to reach
> a width of 50.

I don't think this will be much simpler than just the first method
above: the way to find where the property started is just one
previous-single-property-change call away, right?

Or we could add some new field to the iterator to keep track of the
beginning, and be done with that.