[bug] Pinching to zoom on Android fails occasionally

[rsmarques]

When on an Android device, the two-finger pinch action to zoom produces an inconsistent behaviour, often not zooming on the page.

It happens both inside and outside of sortable components.

No need to provide a JSBin, as it's happening on the demo page.

To Reproduce
Steps to reproduce the behavior:

1. Go to https://sortablejs.github.io/Sortable/ on Chrome in an Android device
2. Perform a two-finger pinch to zoom anywhere on the page.
3. Page doesn't get zoomed occasionally.

Expected behavior

Page should always get zoomed.

Information

Tested on a Huawei P20 Pro, Android 10, Chrome version 84

[aquaductape]

It has to do with this touchmove event. I'll see what I can do :S

Sortable/src/Sortable.js

Lines 2021 to 2028 in d53f85e

	// Fixed #973:
	if (documentExists) {
	on(document, "touchmove", function (evt) {
	if ((Sortable.active || awaitingDragStarted) && evt.cancelable) {
	evt.preventDefault();
	}
	});
	}

[waynevanson]

I own a GalaxyA21s using Firefox 79.0.5 and it works fine on my device.

@aquaductape I'm pretty sure that Sortable.active will be null because no sortables are being dragged, so no defaults will be prevented on a zoom in.

[waynevanson]

@rsmarques Is this on all websites using Sortable, or just the Sortable site?

[aquaductape]

It occurs on all websites when using Android Chrome. When i remove sortablejs on my project, I'm able to zoom consistently again on Android Chrome.

[rsmarques]

@waynevanson as @aquaductape stated, it happens in every website on Android Chrome which uses SortableJS

[Earlopain]

This is still a problem. I recently got rid of JQuery Sortable, and now users are complaing that their gesture doesn't work anymore.