octotablet reads pen events from its own queue on winit's Wayland
connection and only dispatches what is already there. winit read them
from the socket but, finding none of its own events, went back to sleep
without AboutToWait, so pen strokes waited until something else woke the
loop: they showed up late or only after touching the screen. Until
0.39.3 the app redrew continuously, which hid this; the battery fix
there exposed it. Every read from the socket now wakes the app. Idle CPU
under a headless Wayland compositor stays at 0.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
haraldandClaude Opus 5.5
38b860bc32