Prompt becomes invisible after surface resize.

[LordMZTE]

Description

When a surface is resized, the currently active prompt, presumably as indicate to Ghostty via OSC133 becomes invisible. This state is reverted once something is typed in that surface again.

To reproduce

1. Create a surface and enter some text:
   
2. Resize the surface, in my case, I'll create a vertical split to the right to achieve this. Now, the currently "active" prompt only will no longer render:
   
3. Type something into the surface. The prompt will show again:
   

System information

OS: NixOS Vicuna / nixpkgs revision 28e9b6d60ffd048dbbfbce525f8ab5bd726a22c3
Ghostty version: commit 67abd88 built via the nix flake with the nixpkgs input set to follow the above version
Apprt: GTK
Shell: Nushell (ships its own OSC133 support)

[mitchellh]

I'll have to review the logic but I want to note that this is expected (we can still have a bug in the details of the logic of course). Certain OSC133 sequences imply the shell will redraw the prompt line on resize, so Ghostty clears it out. Fish is a good example of this working (the shell integration sets it up). I believe Kitty also clears out the line perhaps their logic is different such that Nushell is ignored.

Like I said, its been a long long time since I looked at this part of the code so I'll have to review.

[LordMZTE]

Thank you! It's very possible that this is an issue on the Nushell side. Let me know if I should open an issue there.

[tristan957]

FWIW I've seen a similar behavior on bash too. Hard for me to confirm it's the same, since I find the behavior I experience hard to reproduce.

[jparise]

See also #1961

[NicolasGB]

Having the same issue. I'm also using nushell un a multiline prompt.

I can reliably reproduce it when creating a new tab, which means resizing.

Here's a small video, let me know if I can provide any more information.

Prompt.disappearing.mp4

[milomg]

Related: nushell/reedline#684 (this is somewhat improved in nushell 101)

[LordMZTE]

Testing this again - I noticed that this issue no longer occurs with nushell 101. The prompt briefly becomes invisible during the resize, but then reappears. I'll still leave this open to track that, though.

[jparise]

FWIW I've seen a similar behavior on bash too. Hard for me to confirm it's the same, since I find the behavior I experience hard to reproduce.

I've also seen this in bash -- most consistently in macOS debug builds, presumably because they run "slower". That implies there could be a (thread?) timing-related element in play.

[trolljoe]

can confirm i'm having the same issue with nushell and starship as my prompt. i'm on latest nushell so idk what could be causing this

[milomg]

Note that the flickering with nushell is caused by automatic batching https://github.com/nushell/reedline/blob/1800dcd362ae59e9b960d7a860cb47281f880a5f/src/engine.rs#L755-L761 (commenting these lines out will speed up the repainting and almost remove the flicker). Maybe this issue should be closed in favor of an issue on nushell/reedline?