[Drag & Drop blocks] Multiple touches are being tracked while dragging a block

[tiagomar]

Describe the bug
Multiple touches are being tracked while dragging a block making it possible to have dragging direction and speed changes due to unintentional touches.

To Reproduce
Steps to reproduce the behavior:

1. Start dragging a block;
2. Using another finger/hand palm
3. Notice that the chip moves to an intermediate point possibly changing dragging direction and speed.

Expected behavior
Only the first touch should be tracked while dragging a block.

Evidence

drag-and-drop-multitouch.mp4

Smartphone:

• Device: Android, iPhone, iPad.

[fluiddot]

I think we could tweak the gesture configuration and limit the number of fingers to activate it. Looks like there's a property named maxPointers that could help us to address the issue.

There's another property (averageTouches), only supported in Android, that might be also interesting to check, as it might be related to the case where having two fingers, the touch position is averaged.

[geriux]

Closing since it was fixed in WordPress/gutenberg#40519