Code highlight problem in tmux

[alexey-yanchenko]

Description

In diff mode, the code has a strange background highlighting of some words. This only applies when OpenCode is running in TMUX. (tmux 3.6a)

Plugins

No response

OpenCode version

1.1.47

Steps to reproduce

No response

Screenshot and/or share link

Operating System

NixOS 25.11

Terminal

Ghostty

[github-actions]

This issue might be a duplicate of or related to existing tmux/terminal rendering issues. Please check:

• Clipboard copy fails in Zellij and other multiplexers (OSC52 written to stdout instead of /dev/tty) #12082: Clipboard copy fails in Zellij and other multiplexers (OSC52 rendering issues)
• Copy-on-Select fails when running opencode via Tmux in Kitty terminal (Linux) #9942: Copy-on-Select fails when running opencode via Tmux in Kitty terminal
• [Windows Git Bash][tmux] opencode cannot run in Git Bash tmux #10129: opencode cannot run in Git Bash tmux
• Screen lag/freezing when typing text (WSL2, TMUX, Alacritty) #8484: Screen lag/freezing when typing text (WSL2, TMUX, Alacritty)

These issues suggest there may be broader terminal multiplexer rendering/escape sequence handling problems that could be related to your diff highlighting issue.

Feel free to ignore if your specific case differs from these.