Shortcuts
- Click / tap — next test pattern
- Space — fullscreen on / off
- D — dead pixels overlay on / off
- I — display info panel on / off
- T — taxi flash (checkerboard)
- Triple swipe up (touch) — taxi half-screen
- G — spiral (B/W); quick second G — rainbow spiral
- G while spiral runs — off
- H + K — this list (hold one, press the other)
- Esc — close this list