right click on Default Link will remove the link

[marylin13]

Hi, I am using the DefaultLinkWidget and set the setMaxNumberPointsPerLink=0 for engine to not create point when click on the link.

I found that when right click on the link, it remove the link , I think the related code is

react-diagrams/packages/react-diagrams-defaults/src/link/DefaultLinkSegmentWidget.tsx

Lines 44 to 49 in 0deaec2

	onContextMenu: () => {
	if (!this.props.link.isLocked()) {
	event.preventDefault();
	this.props.link.remove();
	}
	}

I not sure why this is the default behavior , but in our app we does not want it. Do you mind if I make a PR to make this behavior optional or passing a customize onContextMenu function?