fix(cli): stray 'm' character printed during terminal startup #19081
Description
What happened?
During startup, the Gemini CLI queries the terminal for capabilities (like modifyOtherKeys and Kitty protocol). On some terminals (e.g., Apple Terminal, certain tmux versions), this query results in a stray "m" character being printed to the command line, which can interfere with the user's input or display.
What did you expect to happen?
The terminal capability detection should happen silently in the background without leaving any visual artifacts like a stray "m" on the command line.
Client information
Client Information
Platform: macOS (Darwin)
Architecture: arm64
Version: 0.30.0-nightly (development)
Login information
Google Account (Gemini Code Assist)
Anything else we need to know?
The issue seems related to how certain terminals handle the modifyOtherKeys or Kitty protocol queries. Wrapping the queries in a hidden mode sequence and clearing the line afterwards resolves the visibility issue.