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Latest update and tmux / characters smeared down rightmost column #4036

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opened 2026-01-30 23:36:30 +00:00 by claunia · 5 comments
claunia commented 2026-01-30 23:36:30 +00:00
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Originally created by @cerebrate on GitHub (Sep 25, 2019).

Environment

Windows build number: 18990
Windows Terminal version (if applicable): 0.5.2661.0

Any other software?

tmux 2.8

Steps to reproduce

  1. Install Windows Terminal 0.5.2661.0 on a machine where tmux 2.8 has been installed and displaying correctly with previous Windows Terminal releases.
  2. Open a WSL shell in a Terminal tab, inside tmux.
  3. Run any command which displays text wide enough to use the rightmost column of the screen. For the example screenshots below, I used env.
  4. After observing initial behavior, clear the screen with clear .

Expected behavior

Clean display of command output without character smear; all characters removed when screen cleared.

Actual behavior

On initial run of the command in step 3, the rightmost character of the last line to contain one is "smeared" down the screen until another rightmost character replaces it, thus:

terminal-smear

terminal-smear-2

When the screen is subsequently cleared, all characters displayed in this column remain visible:

terminal-smear-clear

Thus far, I have only been able to reproduce this behavior inside a tmux session, although it was not observed until the latest Windows Terminal update. Additionally, I was using Cascadia Code as my terminal font also previous to that upgrade, without problems.

Originally created by @cerebrate on GitHub (Sep 25, 2019). # Environment ```none Windows build number: 18990 Windows Terminal version (if applicable): 0.5.2661.0 Any other software? tmux 2.8 ``` # Steps to reproduce 1. Install Windows Terminal 0.5.2661.0 on a machine where tmux 2.8 has been installed and displaying correctly with previous Windows Terminal releases. 2. Open a WSL shell in a Terminal tab, inside _tmux_. 3. Run any command which displays text wide enough to use the rightmost column of the screen. For the example screenshots below, I used _env_. 4. After observing initial behavior, clear the screen with _clear_ . # Expected behavior Clean display of command output without character smear; all characters removed when screen cleared. # Actual behavior On initial run of the command in step 3, the rightmost character of the last line to contain one is "smeared" down the screen until another rightmost character replaces it, thus: ![terminal-smear](https://user-images.githubusercontent.com/371623/65578017-a02e5900-df3a-11e9-991e-a20496d0fb91.jpg) ![terminal-smear-2](https://user-images.githubusercontent.com/371623/65578188-ea173f00-df3a-11e9-90b8-9c97c7069c64.jpg) When the screen is subsequently cleared, all characters displayed in this column remain visible: ![terminal-smear-clear](https://user-images.githubusercontent.com/371623/65578215-f8655b00-df3a-11e9-958f-ea4a37d986c2.jpg) Thus far, I have only been able to reproduce this behavior inside a tmux session, although it was not observed until the latest Windows Terminal update. Additionally, I was using Cascadia Code as my terminal font also previous to that upgrade, without problems.
claunia added the Resolution-Duplicate label 2026-01-30 23:36:30 +00:00
claunia commented 2026-01-30 23:36:31 +00:00
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@BartXZX commented on GitHub (Sep 25, 2019):

I'm also seeing this in less and vi.

@BartXZX commented on GitHub (Sep 25, 2019): I'm also seeing this in `less` and `vi`.
claunia commented 2026-01-30 23:36:31 +00:00
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@daviox commented on GitHub (Sep 25, 2019):

It seems that CMD and OpenSSH sessions are affected too, at least in my case.
Column clearing issue in CMD

Windows Version: 1903, build 18362
Windows Terminal Version: 0.5.2661.0
---
Terminal Font: Fira Code
@daviox commented on GitHub (Sep 25, 2019): It seems that CMD and OpenSSH sessions are affected too, at least in my case. ![Column clearing issue in CMD](https://user-images.githubusercontent.com/25099832/65593252-5e300200-df90-11e9-9b34-d245126716ad.gif) ``` Windows Version: 1903, build 18362 Windows Terminal Version: 0.5.2661.0 --- Terminal Font: Fira Code ```
claunia commented 2026-01-30 23:36:31 +00:00
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@j4james commented on GitHub (Sep 25, 2019):

This is likely a duplicate of #2878, which has only just been fixed yesterday.

@j4james commented on GitHub (Sep 25, 2019): This is likely a duplicate of #2878, which has only just been fixed yesterday.
claunia commented 2026-01-30 23:36:31 +00:00
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@zadjii-msft commented on GitHub (Sep 25, 2019):

Yep that looks like a dupe to me. Thanks!

/dup #2878

@zadjii-msft commented on GitHub (Sep 25, 2019): Yep that looks like a dupe to me. Thanks! /dup #2878
claunia commented 2026-01-30 23:36:31 +00:00
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@ghost commented on GitHub (Sep 25, 2019):

Hi! We've identified this issue as a duplicate of another one that already exists on this Issue Tracker. This specific instance is being closed in favor of tracking the concern over on the referenced thread. Thanks for your report!

@ghost commented on GitHub (Sep 25, 2019): Hi! We've identified this issue as a duplicate of another one that already exists on this Issue Tracker. This specific instance is being closed in favor of tracking the concern over on the referenced thread. Thanks for your report!
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Reference: starred/terminal#4036
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