Double wide nerd font glyphs are rendered incorrectly in 1.21 about terminal

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Closed similar issues:

• AtlasEngine rendering wide Nerd Font glyphs incorrectly (#14022), similarity score: 0.84
• 1.16 Preview: Incorrect Nerd Font rendering: double-sized characters are reduced (#13988), similarity score: 0.81
• Some glyphs in Nerd Fonts are rendered with wrong widths (#11769), similarity score: 0.78
• Bad rendering of icons (nerd fonts) with atlas rendering (#14074), similarity score: 0.77
• Incorrect full-width char rendering (#17016), similarity score: 0.76

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[lhecker]

Huh, weird. I thought those triangle glyphs were narrow (1 cell wide)? I just installed the latest version of Ubuntu Mono NF (version 0.80) and U+E0B8, U+E0BA, U+E0BC, and U+E0BE are all narrow for me.

What Ubuntu Mono font are you using? NF (UbuntuMonoNerdFont-Regular.ttf), NFM (UbuntuMonoNerdFontMono-Regular.ttf), or NFP (UbuntuMonoNerdFontPropo-Regular.ttf)?

Can you figure out what codepoints your status line uses, or otherwise give me a printf command (or similar) that allows me to reproduce the issue locally?

[SivanagBalla]

I'm using an earlier verion of Ubuntu Mono NF which i downloaded from https://github.com/ryanoasis/nerd-fonts/blob/master/patched-fonts/UbuntuMono/Regular/UbuntuMonoNerdFont-Regular.ttf
This version has those characters(U+E0B8, U+E0BA, U+E0BC, and U+E0BE) to be double wide.

Sometime down the line (around year back i believe), they (ryanoasis/nerd-fonts) updated those characters to be narrow. So the latest version still have them as narrow.

I kept the older version of font file. Here it is. If you want to try this, you may want to remove the already installed one.
UbuntuMono Nerd Font.zip

[zadjii-msft]

There's a couple ways I could see us taking this:

• This is by-design, the PL glyphs are supposed to be single-wide now, and the terminal is correctly rendering them as such. Users can always opt-out of the Terminal doing this with "font.builtinGlyphs": false...
• ... though, with "font.builtinGlyphs": false, we still should probably render these a little better
• alternatively, I'm not sure if we can check the font ahead of time, and manually scale our PL drawing to the same width the font expects them to be

[lhecker]

Users can always opt-out of the Terminal doing this with "font.builtinGlyphs": false...

FYI you can also find the setting here:

I think we should consider closing this as "by design" for the following reasons:

• Newer version of NF have these glyphs as narrow.
• Adjusting the width of builtin glyphs to match the font would break their biggest strength of being fully "gap-less".
• Adjusting the size of font glyphs in the past has repeatedly proven itself to be very error prone. Adjusting the vertical/horizontal alignment is less bad, but still somewhat error prone. It should be reserved to situations where there aren't any alternatives.

@SivanagBalla Is there a reason why you don't want to use a newer Ubuntu Mono NF version?

[SivanagBalla]

I liked the older double wide verison of these characters and so i kept it.
Anyway, turning off Builtin Glyphs worked. This is good enough for me. But does this option have any other side effects?

[lhecker]

No, it simply disables these builtin glyphs:

The benefit of them being builtin is that they're "pixel perfect", unlike the corresponding glyphs in a font.

[zadjii-msft]

Yea I second closing by design. If disabling the builtin glyphs works for you, that's probably the best we'll be able to do in the general case.

Thanks for following up! TIL that there was a version of NF where those glyphs were double-wide