autoScrollSensitivity property
Defines the size of the Rect created around the drag global position when dragging a tree node.
The Rect is used to detect when the user drags too close to the edges of the scrollable viewport to start auto scrolling if necessary.
If autoScrollSensitivity is set to 100.0, the detected area will be
50.0 pixels in each direction centered on the drag global position.
Defaults to 100.0.
Implementation
final double autoScrollSensitivity;