A touch-surface mouse like the Magic Mouse emits a flood of tiny, low-
magnitude wheel events — plus an inertial momentum tail — for a single
physical gesture, and even a light brush of the surface produces spurious
deltas. The previous 100ms trailing debounce collapsed bursts but did not
filter by magnitude, so isolated micro-touches and the momentum tail each
turned a page, cascading into continuous accidental page turns in
paginated mode.
Add a wheel gesture detector that accumulates normalized wheel travel and
only flips once it crosses a deliberate-intent threshold, then swallows the
rest of the stream (the momentum tail) until the wheel goes idle — so one
physical gesture flips exactly one page, mirroring native readers.
Closes#4117
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Huang Xin
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