MS Sans Serif, formerly "Helv" (interesting name, isn't it?) in Windows 1.x, which went on to become "Microsoft Sans Serif" as a vector TrueType font, is a proportional raster font which looks very much like Helvetica and Arial. In mono's libgdiplus and System.Drawing.SystemFonts, the vector version "Microsoft Sans Serif" is hard coded as default font, so it looks necessary to address its usage by adding aliases. (I am not particularly interested in the bitmaps.) (There is also a bitmap called "MS Serif" ("Tms Rmn" in Windows 1.x) by Microsoft, but MS was sane enough not to create two TrueType look-alikes for Serif, and "Times New Roman" aliases are already there.)
Oh, bad news, libgdiplus is actually using the bitmap-era "MS Sans Serif" name. I am sending them bug reports to make them use "Serif" too.
> to make them use "Serif" too. s/Serif/Sans/2
This may be not what exactly you want to see but somewhat improved with https://cgit.freedesktop.org/fontconfig/commit/?id=b6cf1bcaf626b5c8e1efdf03006d18fb744d9b72
Hmm, that actually sounds good enough for mono/libgdiplus UI usage.
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