GTK: Unexpected whitespace rendering in some fonts

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Dear Scintilla hackers,

I noticed the following peculiarity in GTK 3 builds (reproducible in the HE=
AD
commit): When using the "Terminess Nerd Font" [1] with and without 1.5-widt=
h
icon glyphs, leading spaces get squashed unexpectedly when inserting the
overlarge Unicode glyph 0x2739 (=E2=9C=B9 ). Attached is a screenshot demon=
strating
the issue in Bait.

Any idea why this might be?

Best regards,
Robin

[1]: https://github.com/ryanoasis/nerd-fonts/releases/download/v3.4.0/Termi=
nus.zip

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