[Bug report] Blue triangle prompt marker appears in Royal TSX iTerm terminal when using zsh

Feature Requests Royal TSX (for macOS)
1

Royal TSX’s iTerm terminal plugin shows an unwanted blue triangle prompt marker at the beginning of each prompt when using zsh with Oh My Zsh.

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The marker appears to be triggered by Oh My Zsh’s omz_termsupport_cwd hook, which emits OSC 7 current-directory updates.

Removing only this hook fixes the issue.

Environment

  • Royal TSX with iTerm terminal plugin
  • macOS
  • Shell: zsh
  • Oh My Zsh enabled
  • Prompt: oh-my-posh

Expected Behavior

OSC 7 current-directory updates should update terminal metadata only.

They should not create or display a prompt mark indicator.

Reproduction Steps

  1. Open a Royal TSX terminal session using zsh.
  2. Make sure Oh My Zsh is loaded.
  3. Confirm that omz_termsupport_cwd is active:
print -rl -- $precmd_functions

Example output includes:

omz_termsupport_cwd
  1. Observe the blue triangle marker at the beginning of each prompt.
  2. Remove only the current-directory hook:
autoload -Uz add-zsh-hook
add-zsh-hook -d precmd omz_termsupport_cwd
  1. Press Enter a few times.

The blue triangle marker disappears.

Temporary Fix

As a workaround, remove the Oh My Zsh current-directory terminal hook after Oh My Zsh is loaded.

In ~/.zshrc, add this immediately after:

source $ZSH/oh-my-zsh.sh

Add:

add-zsh-hook -d precmd omz_termsupport_cwd

This removes only the omz_termsupport_cwd hook. The shell prompt continues to work normally.

Note: this may disable terminal-side current-directory tracking features that depend on OSC 7.

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Suspected Cause

Royal TSX’s iTerm terminal plugin may be treating OSC 7 current-directory updates as shell integration prompt marks, or otherwise enabling a visual mark indicator when this sequence is emitted by zsh/Oh My Zsh.

OSC 7 should not create a visible prompt marker by itself.