gemini-cli PR kills tmux flicker with synchronized output and isolated spinner rendering

diegogodinezr · ghdev · 2026-10-13

A priority P2, size/xl PR in google-gemini/gemini-cli fixes screen flickering in terminal multiplexers (notably tmux), closing #22004.
Core technique: bracket interactive UI frame writes with synchronized output — DEC Private Mode 2026 (\x1b[?2026h/l) on standard terminals (atomically buffered where supported, silently ignored elsewhere), and tmux DCS synchronized update sequences (\x1bP=1s…\x1b\\) when TMUX is set.
It also isolates spinner state: tick intervals are localized inside CliSpinner/GeminiSpinner, and spinner, LoadingIndicator, StatusRow, etc. are wrapped in React.memo so frame ticks don't re-render parents/siblings; spinner interval drops to 120ms under tmux to cut PTY redraw overhead.
A non-obvious, reusable pattern for anyone building terminal TUIs (especially React/Ink-based).

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