onBeforeTaskMove

fires before a task is moved to a new vertical position

id	string|number	the id of the task to move
parent	string|number	the parent id
tindex	number	the index of the position in the parent branch that the task will be moved to

boolean

defines whether the default action of the event will be triggered (true) or canceled (false)

Example

//prevent moving to another sub-branch:
gantt.attachEvent("onBeforeTaskMove", function(id, parent, tindex){
    const task = gantt.getTask(id);
    if(task.parent != parent)
        return false;
    return true;
});

The event is blockable. Return false to cancel moving of the task.

Note, the event fires in 2 cases:

1. While calling the method moveTask
2. While the option order_branch is enabled in the default mode (gantt.config.order_branch = true;) and a user drags tasks

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