A pen reports far more often than frames come (an Apple Pencil up to 240 times
a second): the canvas now hands the tool each move of the frame with its
pressure instead of the last one only, and the web shell feeds Safari's
coalesced pen events. Mouse input is unchanged.
Read pen and finger Pointer Events in the web shell (capture phase) instead of
eframe's touch handlers, which can't tell a pen from a finger and see every
touch twice. The pen drives the pointer with its pressure and hovers; fingers
are touch contacts for pinch, two-finger pan and undo/redo taps. Once a pen
has been seen (remembered in localStorage), a finger or a resting palm never
presses a tool on the canvas, and a pen landing cancels fingers already down.
A long press drops the tool press and opens the context menu.
The page no longer scrolls, zooms or selects under touch, and the canvas
stays inside the safe areas of a full-screen app.
gniax