Screensaver exit key does not flash in the corner
A change merged into quattro turns terminal echo off in the screensaver, so the key that stops it does not flash in the bottom-left corner.
The screensaver waits for a key with read -n1, which leaves tty echo on. ttfx runs with --no-restore-cursor, so the cursor sits in the bottom-left corner and the key flashes there for a frame or two before the window closes.
Echo is turned off once at startup with stty -echo. read -s alone would not cover keys typed between reads. The pull request says a screen recording of stopping the screensaver with a keypress showed the echoed character before the change and not after it.