[Libreoffice-bugs] [Bug 127553] Double arrow not showing up on libreoffice for windows, but showing on libreoffice for ubuntu and microsoft word for windows

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=127553

--- Comment #3 from V Stuart Foote <vstuart.foote at utsa.edu> ---
(In reply to 4layq596ovwv from comment #2)
> Ok, I see, my friend is using Windows and explaining this seems a bit ...
> difficult...
> 
> In your response you say the following : font fall back occurs--Ubuntu picks
> one up, Windows does not.
> 
> Why can windows not manage to find a fallback ?

Completely different font fall back mechanisims.

> 
> I'm a huge open-source advocate and like a lot LibreOffice, but here I don't
> even myself understand what exactly the problem is, I guess I am quite a
> noob regarding fonts and other related aspects but I'm really confused why
> there couldn't be an easy fix since it works with the doublearrow "Starmath"
> macro.

Because there is no sm defined macro for the "LONG LEFT RIGHT DOUBLE ARROW",
meaning there is no linkage to the Unicode point 0x27fa, even if it were
available in OpenSymbol font used by default for StarMath/MathML formulas in
the Formula editor.

And, while you can enter it as a StarMath litteral, e.g. "⟺", still no
assurance Windows (or Linux or macOS) will pick up a suitable fallback font to
the default OpenSymbol font.

As indicated, you can force use of a specific font per formula, and select a
font that has more extensive coverage of Unicode Mathematical symbols--we just
can not specify an alternative default font.

What prevents us from moving this forward is a fair number of Private Use Area
glyph definitions provided from OpenSymbol that first need to be migrated to
their correct Unicode point and allow a different font default to be set.

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