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Underline not rendered after some SGR 22/39/49 #4286

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opened 2026-01-30 23:43:02 +00:00 by claunia · 0 comments
claunia commented 2026-01-30 23:43:02 +00:00
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Originally created by @egmontkob on GitHub (Oct 5, 2019).

Environment

Windows build number: Win32NT 10.0.18362.0
Windows Terminal version (if applicable): 0.5.2762.0

Steps to reproduce

echo -e '\e[4m underlined \e[33m yellow \e[39m should still be underlined \e[m'

Expected behavior

The entire line should be underlined.

Actual behavior

The "should still be underlined" bits aren't underlined.

Note that SGR codes 22, 27, 39 and 49 seem to cause this effect, but only if they're predeced by a 1, 7, 30-37 or 40-47, resp., that is, only if they do actually turn off some other attribute.

Also note that if the "should still be underlined" text is made longer so that it overflows to the next line (or even multiple new lines), it's underlined in the last one of these lines. This makes it perhaps a reincarnation of #47.

Furthermore, changing the window width and thus causing a reflow of the text removes the underlining from the last line.

Originally created by @egmontkob on GitHub (Oct 5, 2019). <!-- 🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨 I ACKNOWLEDGE THE FOLLOWING BEFORE PROCEEDING: 1. If I delete this entire template and go my own path, the core team may close my issue without further explanation or engagement. 2. If I list multiple bugs/concerns in this one issue, the core team may close my issue without further explanation or engagement. 3. If I write an issue that has many duplicates, the core team may close my issue without further explanation or engagement (and without necessarily spending time to find the exact duplicate ID number). 4. If I leave the title incomplete when filing the issue, the core team may close my issue without further explanation or engagement. 5. If I file something completely blank in the body, the core team may close my issue without further explanation or engagement. All good? Then proceed! --> <!-- This bug tracker is monitored by Windows Terminal development team and other technical folks. **Important: When reporting BSODs or security issues, DO NOT attach memory dumps, logs, or traces to Github issues**. Instead, send dumps/traces to secure@microsoft.com, referencing this GitHub issue. If this is an application crash, please also provide a Feedback Hub submission link so we can find your diagnostic data on the backend. Use the category "Apps > Windows Terminal (Preview)" and choose "Share My Feedback" after submission to get the link. Please use this form and describe your issue, concisely but precisely, with as much detail as possible. --> # Environment ```none Windows build number: Win32NT 10.0.18362.0 Windows Terminal version (if applicable): 0.5.2762.0 ``` # Steps to reproduce echo -e '\e[4m underlined \e[33m yellow \e[39m should still be underlined \e[m' # Expected behavior The entire line should be underlined. # Actual behavior The "should still be underlined" bits aren't underlined. Note that SGR codes `22`, `27`, `39` and `49` seem to cause this effect, but only if they're predeced by a `1`, `7`, `30-37` or `40-47`, resp., that is, only if they do actually turn off some other attribute. Also note that if the "should still be underlined" text is made longer so that it overflows to the next line (or even multiple new lines), it's underlined in the last one of these lines. This makes it perhaps a reincarnation of #47. Furthermore, changing the window width and thus causing a reflow of the text removes the underlining from the last line.
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Reference: starred/terminal#4286
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