Terminal Emulators
URxvt has issues double-wide font glyph characters (I believe particularly with ambiguous width characters). Related search terms for reference: full-width, double-width, non-monospaced, squished icons)
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for full width support/patches see projects such as: powerman's wcwidth-icons or blueyed's WIP wcwidth
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there are also some setting changes that can be tried, like the method mentioned by mftrhu in issue #150 comment