run getHelperDimensions after shouldCancelStart

Right now I developing app with expanded panels.
So on sorting start (when starting dragging drag handler) - I need to collapse all panels and start sort.

I'm using _shouldCancelStart_ as "beforeStart" - to execute code that collapses my panels before sorting started (if i use _onSortStart_ instead of _shouldCancelStart_ - then sortingHelper is looks like expanded panel).

And problem is that _getHelperDimensions_ is triggering before _shouldCancelStart_ .
So it sets width and height of expanded panel for sortingHelper.

Right now I manually setting height and width for helper using _getHelperDimensions_ (height of collapsed panel is static so it's easy for me to hardcode it).
```
({
width: node.offsetWidth,
height: 48,
})}
lockAxis="y"
shouldCancelStart={this.collapseAll}
onSortEnd={(sortData) => { this.onSortEnd(sortData, activeTab, data); }}
/>
```

OK would be if _getHelperDimensions_ would run after _shouldCancelStart_ or _onSortStart_.
Great would be to have something like "beforeSortStart".

Also if _userDragHandle_ is true - _shouldCancelStart_ should be triggered only when dragHandler is clicked/moved (right now from what I understand _shouldCancelStart_ fires always when you click sortableItem , even if you're not clickng dragHandler and it's enabled)