setWindow() is not working with animation if timeline area was swiped before

[dsentker]

My timeline has several rows and exceeds the window height. The timeline window can be moved up- and downwards to see all items.

I experienced the issue that all setRange()-related functions (such as zoomIn(), zoomOut()) are not working when this task is animated (as set per default). When deactivating animation, everything worked fine.

I come to the conclusion that the bug appears when the user moves the window vertically before using the zoomIn() function. In that case, timeline.range.props.touch.dragging is internally set to true. That causes the animation to stop, as seen here in the source code:

var next = function next() {
if (!me.props.touch.dragging) {
	var now = _Date$now();
	var time = now - initTime;
	var ease = easingFunction(time / duration);

Due to the "swipe" motion on the device, the "drag" process was not completed. So timeline gets stuck and it is not possible to perform the action.

Since I'm not very good in JavaScript, I don't know exactly where to start here. An approach would be analogous to my workaround:

function zoomOut() {
    timeline.range.props.touch.dragging = false;
    timeline.zoomOut(1);
}