Lifting one finger of a pinch removed the document listeners, so the
remaining finger's drag, which Cesium carries on with, stopped counting.
A gesture now ends only when its last pointer lifts or no touches are
left. And a gesture whose end never reaches the page (the window loses
focus mid-drag, or the page is hidden) left the listeners attached, so
a later unrelated drag counted as camera input; a blur or hidden page
now stops following it and drops its pending input.
Sameh Khamis
02a6739466