shell-integration causes prompt to disappear when resizing

[grawity]

Issue Description

When shell-integration is enabled (default), when the bash shell is used, when PS1 contains a dynamically generated prompt that consists of more than one line, resizing the Ghostty window causes all but the last line of the prompt to disappear.

As a workaround, I've set shell-integration = none to disable it. Fortunately ghostty's cwd reporting turns out to be compatible with that of gnome-terminal, so I can reuse my custom PROMPT_COMMAND function to make that work again.

Expected Behavior

All prompt lines produced by PS1 should remain visible.

Or, it should be possible to disable the 'prompt redraw' part of shell-integration without losing the 'cwd reporting' feature. (Though in this case I've made cwd reporting work by reusing the code I already had for gnome-terminal.)

Actual Behavior

All prompt lines, except for the last one, become blank.

Reproduction Steps

1. Open Ghostty.

2. Run declare -p PROMPT_COMMAND to make sure that the __bp_* "bash preexec" stuff that Ghostty injects is present.

3. Set PS1 to call a function to dynamically generate the prompt. For example:

   PS1='$(echo line1; echo line2; echo line3) \$ '
   

   (Single quotes are deliberate. Bash will process the $(...) expansion every time the prompt is shown.)

4. The prompt should look like:

   ┌────────────────────────┐
   │line1                   │
   │line2                   │
   │line3 $ _               │
   │                        │
   │line1                   │
   │line2                   │
   │line3 $ _               │
   │                        │
   │                        │
   └────────────────────────┘
   

5. Resize the window.

6. The prompt now looks like:

   
   ┌────────────────────────┐
   │line1                   │
   │line2                   │
   │line3 $ _               │
   │                        │
   │                        │
   │                        │
   │line3 $ _               │
   │                        │
   │                        │
   └────────────────────────┘
   

   that is, the initial lines of the last prompt have disappeared.

Ghostty Logs

warning(stream): unimplemented OSC callback: terminal.osc.Command{ .end_of_command = terminal.osc.Command__struct_253184{ .exit_code = 0 } }
warning(stream): unimplemented OSC command: end_of_command

Ghostty Version

Ghostty 1.2.0-arch1

Version
  - version: 1.2.0-arch1
  - channel: tip
Build Config
  - Zig version   : 0.14.1
  - build mode    : builtin.OptimizeMode.ReleaseFast
  - app runtime   : apprt.Runtime.gtk
  - font engine   : font.main.Backend.fontconfig_freetype
  - renderer      : renderer.generic.Renderer(renderer.OpenGL)
  - libxev        : io_uring
  - kernel version: 6.16.7-arch1-1
  - desktop env   : gnome
  - GTK version   :
    build         : 4.18.6
    runtime       : 4.20.1
  - libadwaita    : enabled
    build         : 1.7.7
    runtime       : 1.8.0
  - libX11        : enabled
  - libwayland    : enabled

OS Version Information

Arch Linux

(Linux only) Display Server

Wayland

(Linux only) Desktop Environment/Window Manager

GNOME 49

Minimal Ghostty Configuration

literally the default config

Additional Relevant Configuration

No response

I acknowledge that:

• I have reviewed the FAQ and confirm that my issue is NOT among them.
• I have searched the Ghostty repository (both open and closed Discussions and Issues) and confirm this is not a duplicate of an existing issue or discussion.
• I have checked the "Preview" tab on all text fields to ensure that everything looks right, and have wrapped all configuration and code in code blocks with a group of three backticks (```) on separate lines.

[rhodes-b]

Can you show a video of this behavior?

I didn't originally see the export PS1 when looking on my phone I can see what you reported now

There have been other reports of loosing text in the scrollback due to resizing your window previously and it doesnt have to do with shell-integration at all. It reproduces on any terminal ive tried that reflows text. again this doesn't require shell-integration so it should be unrelated

[jsrlabs]

I've also seen the same problem. My 2-line bash prompt loses the first line when resizing ghostty. Is there a reason this issue is not in the "open" state?