https://bugs.documentfoundation.org/show_bug.cgi?id=112594

--- Comment #16 from ⁨خالد حسني⁩ <[email protected]> ---
(In reply to Volga from comment #9)
> Is there anyway to make NNBSP works the same as ZWJ?

I got fooled by this visible difference for the better part of the day, but
actually we are treating NNBSP and ZWJ the same here, they are always grouped
with the previous character when we itemize scripts, so they are part of the
Western text here.

The difference is that HarfBuzz handles ZWJ itself and it is cleaver enough to
still handle it even when asked to shape only the part of the text string after
ZWJ. The NNBSP, on the other hand seems to be handled by the font itself (using
glyph substitutions), so when we ask for shaping only the part of the text
string after NNBSP, font substitutions don’t get applied.

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