[GH-ISSUE #336] Weird artifacts due to emojis #855

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opened 2026-03-14 08:49:53 +03:00 by kerem · 3 comments

kerem commented

2026-03-14 08:49:53 +03:00

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Originally created by @veracioux on GitHub (Nov 22, 2025).
Original GitHub issue: https://github.com/anomalyco/opentui/issues/336

I'm not sure how the behavior is best described. But it seems that the grapheme width is not being calculated correctly so the characters are not being overwritten, leaving artifacts.

https://github.com/user-attachments/assets/cbb359f3-5bb7-4e06-92c0-2ab71ea217e2

Originally created by @veracioux on GitHub (Nov 22, 2025). Original GitHub issue: https://github.com/anomalyco/opentui/issues/336 I'm not sure how the behavior is best described. But it seems that the grapheme width is not being calculated correctly so the characters are not being overwritten, leaving artifacts. https://github.com/user-attachments/assets/cbb359f3-5bb7-4e06-92c0-2ab71ea217e2

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2026-03-14 08:49:53 +03:00

kerem commented

2026-03-14 08:50:04 +03:00

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@kommander commented on GitHub (Nov 22, 2025):

Is that Alacritty?

@kommander commented on GitHub (Nov 22, 2025): Is that Alacritty?

kerem commented

2026-03-14 08:50:09 +03:00

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@veracioux commented on GitHub (Nov 22, 2025):

@kommander Ah, indeed. It doesn't happen in kitty or ghostty.

Ghostty:

Kitty:

@veracioux commented on GitHub (Nov 22, 2025): @kommander Ah, indeed. It doesn't happen in kitty or ghostty. Ghostty: <img width="929" height="53" alt="Image" src="https://github.com/user-attachments/assets/79d33239-f487-40d9-8cfc-735c1512ae6a" /> Kitty: <img width="854" height="48" alt="Image" src="https://github.com/user-attachments/assets/b52f4747-1a40-4777-9c25-d025d59bb882" />

kerem commented

2026-03-14 08:50:14 +03:00

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@kommander commented on GitHub (Nov 22, 2025):

Yeah, Alacritty does not support ZWJ shaping. Opentui has a no_zwj mode, which is not properly working yet. And when tmux is in between it might shadow when Alacritty is used, so it's hard to tell.

@kommander commented on GitHub (Nov 22, 2025): Yeah, Alacritty does not support ZWJ shaping. Opentui has a `no_zwj` mode, which is not properly working yet. And when tmux is in between it might shadow when Alacritty is used, so it's hard to tell.