Setting macOS tabs title bar style and background opacity and restoring window save state causes tabs to be hidden

[anirudhsama]

I've configured Ghostty with the following settings and it results in something weird.

background-opacity = 0.95
background-blur-radius = 20

# macOS specific features
macos-titlebar-style = tabs
macos-option-as-alt = true 
window-save-state = always
window-vsync = true
window-colorspace = display-p3
quick-terminal-screen = macos-menu-bar

Steps to reproduce:

1. Configure with the above settings.
2. Open a few tabs.
3. Quit Ghostty.
4. Open Ghostty.

Bug:

• The tab bar only shows the current active tab, not all the tabs that are available.
• But we can navigate to it via key binds like cmd+[ and cmd+].

Other observations:

• When we open a new tab after relaunching, then all the tabs in the tab bar becomes visible.
• As long as the newly opened tab is active, all tabs are visible.
• But when the new tab opened is closed or we navigate to an older (restored) tab, then the tabs are invisible.

Recording: https://cln.sh/CDXlLKBd

macOS Sequoia 15.2

❯ ghostty --version
Ghostty 0.1.0-main+05fd5e0c

Version
  - version: 0.1.0-main+05fd5e0c
  - channel: tip
Build Config
  - Zig version: 0.13.0
  - build mode : builtin.OptimizeMode.ReleaseFast
  - app runtime: apprt.Runtime.none
  - font engine: font.main.Backend.coretext
  - renderer   : renderer.Metal
  - libxev     : main.Backend.kqueue

[mitchellh]

I thought we documented somewhere that window state restoration doesn't work well with titlebar tabs... oh well, this is worth fixing. The issue is a race condition between save state restoration and titlebar tab setup (I think). This can usually fixed by deferring titlebar setup by a few event loop ticks. Easier said than done. 😄

[anirudhsama]

Just checked the documentation and it does say that. Apologies 😅. It works fine if the background-opacity is 1 and thats the configuration I had been using for a long time.