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ansi DEC double-height text lines cannot be un-set 😲 #23340

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opened 2026-01-31 08:39:22 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 08:39:22 +00:00
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Originally created by @ClaireCJS on GitHub (Jun 5, 2025).

Windows Terminal version

No response

Windows build number

10.0.19045.5854

Other Software

No response

Steps to reproduce

  1. Create a line of double-height text:

Image

  1. After drawing, move back up and “type” over the first line of double-height text with something, to see some EXPECTED behavior that looks glitch but is as designed:

Image

  1. Try inserting the character that turns off DEC text. It’s impossible to “flip” this line in the console back to normal-height text. It’s stuck forever?

Image

No, not quite forever. The ansi erase to end of line sequence won’t fix it, but the ansi erase to end of screen sequence will.
[However, in my personal story where I’m actually the main character—unlike here—this wipes my status bar.]

Image

So yeah. Inconsistent a bit...

Sets the line back to normal sized:

  • erase to end of screen ansi sequence

Does not Set the line back to normal sized:

  • erase to end of line ansi sequence
  • the ansi sequence to set a line to normal-sized / not dec-double-sized

Expected Behavior

I’d expect all 3 of these to set the line to small — erase to EOL, erase end of screen, and the "big off" (escape # 0) sequence.

Image

Image

Image

Actual Behavior

Only 1 of the 3 worked and it had the unintended side effect of erasing things on the screen I did not want erased.

Originally created by @ClaireCJS on GitHub (Jun 5, 2025). ### Windows Terminal version _No response_ ### Windows build number 10.0.19045.5854 ### Other Software _No response_ ### Steps to reproduce 1) Create a line of double-height text: ![Image](https://github.com/user-attachments/assets/2d73d8c5-bc75-4a88-8e17-82e5733acff0) 2) After drawing, move back up and “type” over the first line of double-height text with something, to see some EXPECTED behavior that looks glitch but is as designed: ![Image](https://github.com/user-attachments/assets/334f101b-d364-4d65-8586-7b1f5c7d8581) 3) Try inserting the character that turns off DEC text. It’s impossible to “flip” this line in the console back to normal-height text. It’s stuck forever? ![Image](https://github.com/user-attachments/assets/8df6811a-7998-4fce-86ed-cf300a3337f3) No, not _quite_ forever. The ansi erase to end of line sequence won’t fix it, but the ansi erase to end of _screen_ sequence will. [However, in my personal story where I’m actually the main character—unlike here—this wipes my status bar.] ![Image](https://github.com/user-attachments/assets/8dae592e-6878-4490-ba1b-6a72b8b31663) So yeah. Inconsistent a bit... Sets the line back to normal sized: - erase to end of screen ansi sequence Does not Set the line back to normal sized: - erase to end of line ansi sequence - the ansi sequence to set a line to normal-sized / not dec-double-sized ### Expected Behavior I’d expect all 3 of these to set the line to small — erase to EOL, erase end of screen, and the "big off" (escape # 0) sequence. ![Image](https://github.com/user-attachments/assets/a97b4f32-817b-46ab-b355-4a9deed0043b) ![Image](https://github.com/user-attachments/assets/e749beb9-b917-4b5f-9dd9-df233e0a51c6) ![Image](https://github.com/user-attachments/assets/43efa2b6-f60f-4499-a299-003d9fe087c1) ### Actual Behavior Only 1 of the 3 worked and it had the unintended side effect of erasing things on the screen I did not want erased.
claunia added the Resolution-By-DesignNeeds-TriageIssue-Bug labels 2026-01-31 08:39:22 +00:00
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Reference: starred/terminal#23340
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