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Perl color command produces strange glyphs #6642

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opened 2026-01-31 00:43:42 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 00:43:42 +00:00
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Originally created by @rdnlsmith on GitHub (Feb 27, 2020).

Environment

Windows build number: 10.0.18363.0
Windows Terminal version (if applicable): 0.9.433.0

Any other software?

PowerShell: 6.2.4
Git: 2.25.1.windows.1

Steps to reproduce

I was trying out diff-so-fancy with their recommended color settings, and encountered a very strange issue. I'm not convinced this is a problem with Windows Terminal, but I don't have enough knowledge in this area to be sure so I wanted to see what you all think.

The minimum reprod is to run the following perl script. I've also run the equivalent PowerShell script, which works correctly; see screenshot below.

binmode(STDOUT, "encoding(UTF-8)");
$bar = "\x{2500}" x 50;
$yellow = "\e[38;5;11m";
$reset = "\e[0m";
print "$yellow$bar$reset\n";

Expected behavior

A 50-char yellow line is displayed.

Actual behavior

Strange, repeating glyphs appear, in foreground-color and a gray highlight.

image

Thanks in advance for your time!

Originally created by @rdnlsmith on GitHub (Feb 27, 2020). <!-- 🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨 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: 10.0.18363.0 Windows Terminal version (if applicable): 0.9.433.0 Any other software? PowerShell: 6.2.4 Git: 2.25.1.windows.1 ``` # Steps to reproduce I was trying out [diff-so-fancy](https://github.com/so-fancy/diff-so-fancy) with their recommended color settings, and encountered a [very strange issue](https://github.com/so-fancy/diff-so-fancy/issues/361). I'm not convinced this is a problem with Windows Terminal, but I don't have enough knowledge in this area to be sure so I wanted to see what you all think. The minimum reprod is to run the following perl script. I've also run the equivalent PowerShell script, which works correctly; see screenshot below. ```perl binmode(STDOUT, "encoding(UTF-8)"); $bar = "\x{2500}" x 50; $yellow = "\e[38;5;11m"; $reset = "\e[0m"; print "$yellow$bar$reset\n"; ``` # Expected behavior A 50-char yellow line is displayed. # Actual behavior Strange, repeating glyphs appear, in foreground-color and a gray highlight. ![image](https://user-images.githubusercontent.com/4039042/75491036-3f8cc780-5983-11ea-96f4-cb6edf11fdc0.png) Thanks in advance for your time!
claunia added the Needs-TriageResolution-ExternalNeeds-Tag-Fix labels 2026-01-31 00:43:42 +00:00
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Reference: starred/terminal#6642
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