Make patch for #11021 bulletproof - hidden selection container may not be present in DOM any more.
Comments.
Merge branch 't/11393'
Second approach for drag handler repositioning - upon wrapper mouseover event.
Function positionDragHandler moved to widget#updateDragHandlerPosition.
Changed trigger event for drag handler reposition to mouseenter. Changed drag handler default css properties.
Added drag handler position cache, and added snapshot locking.
Added comment about drag handler workaround.
Changed object comparing method.
Use setStyles instead of double setStyle.
Don't use loop to compare two values.
Value is used only once - don't declare it.