swipe-tracker: Don't discard swipes that start outside swipe area

Alice Mikhaylenko requested to merge wip/exalm/flap-swipe into main

While this makes perfect sense for touchpad, on touch it's useful to be able to start a swipe outside the swipe area and move the finger over to the swipe area.

This should make swipes more responsive in AdwFlap.

See libhandy!738 (closed)

Edited by Alice Mikhaylenko

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