Pointer/touch pinch gestures on the canvas intend to have no effect on the Diagram, but also no effect on the page.
Pointer/touch pinch gestures on the canvas intend to have no effect on the Diagram, but will not be prevented, and may bubble up the page to have other effects (such as zooming the page).
Pointer/touch pinch gestures on the canvas intend to zoom the Diagram. This is the default.
This enumeration specifies possible values for ToolManager.gestureBehavior.
since3.0