Transparency artifacts after `Ctrl+Z` suspend/resume in terminals with background opacity

[acegikmoo]

Description:

When suspending OpenCode with Ctrl+Z and resuming with fg, the TUI displays visual artifacts, specifically transparency bleeding through cell backgrounds in terminals like kitty that have background transparency enabled.

Steps to Reproduce

1. Set background_opacity below 1.0 in kitty.conf
2. Run any OpenTUI app in Kitty
3. Press Ctrl+Z to suspend
4. Run fg to resume

Expected Behavior

TUI renders identically after resuming with no visual changes.

Environment

• Terminal: Kitty with background_opacity 0.85
• OS: Arch linux
• Shell: zsh

note:

resizing fixes it.