These docs are for an old release.
Info on upgrading to v4
selectMinDistance 3.1.1
The minimum distance the user’s mouse must travel after a mousedown, before a selection is allowed.
Integer, default: 0
The default value of 0 puts no restriction on the distance the mouse must travel.
A non-zero value is useful for differentiating a selection from a dayClick.
This setting is only applicable to mouse-related interaction. For touch interation, see selectLongPressDelay.