Conflict trying to .filter() with a false value if there is also a d3-zoom active

[antonellopasella]

Hi all, I have a problem trying to let d3-brush and d3-zoom works together on a multitouch enabled device.

My expected behavior would be to only brush on single touch event and let the user pinch/zoom with two fingers.

The problem occours when I return false testing event touches count (>1), then an error raise.