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Re: Ligatures (was: Unify the Platforms: Cairo+FreeType+Harfbuzz Everywh

From: Clément Pit-Claudel
Subject: Re: Ligatures (was: Unify the Platforms: Cairo+FreeType+Harfbuzz Everywhere (except TTY))
Date: Mon, 18 May 2020 13:31:30 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0

On 18/05/2020 12.08, Eli Zaretskii wrote:
> On second thought, I think I misunderstood you.  If the font that is
> used shows "ffi" as a _single_ glyph ffi, and LibreOffice indeed
> highlights parts of this glyph, then I'd like to know how it does
> that, and how far does this capability extend.  I mean, what does it
> do with ligatures like ae, displayed as æ -- does it highlight the
> common vertical stroke for both parts?  And what about "st", displayed
> as st -- this has a curved "hand" connecting s and t -- to which of the
> 2 does it belong for the purposes of highlighting?  There's also "hv"
> displayed as ƕ, let alone "fs" displayed as ẞ and "fz" displayed as
> ß.

I've attached a screenshot with a few examples, though I couldn't find a font 
that displays ae as æ.

Firefox does the same as LibreOffice (try it here, for example: 
Since Firefox uses Harbuzz, I think there's a good chance we can support that 
feature too :)

Attachment: ligatures.png
Description: PNG image

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