I found the same last December and had a look into it, but my conclusion was that it's a bug in the font/libc, so I didn't reported my findings here.
From my notes back then: - st expects chars to have a fixed width (see [1]). - It uses wcwidth(3) to get the length and reserves as much space on the screen. - For a lot of UTF-8 emojis and symbols wcwidth return -1 (at least on my Debian unstable libc6 2.22-6) and st assumes a width of 1 for them (st.c:2937 in current HEAD). - If the symbol in your font is actually bigger, parts of it are overdrawn. So it depends on your wcwidth and font to get this effect. Patches for both welcome ;). Cheers Jochen [1] https://en.wikipedia.org/wiki/Halfwidth_and_fullwidth_forms
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