The terminal emulator knows what font is being used so it should be possible to predict it.
The terminal application doesn't know the font. The best you can do is discover ambiguous widths by printing codepoints and checking the change in cursor position. That's a suboptimal experience.
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The terminal application doesn't know the font. The best you can do is discover ambiguous widths by printing codepoints and checking the change in cursor position. That's a suboptimal experience.