When enabling AllowNestedDocks dock resizing by mouse does not work correct. The divider moves faster than the mouse.

How to reproduce:
*Create a new Qt GUI project with QMainWindow
*Set the mainwindow dockOptions to Animated Docks | AllowNestedDocks
*Insert four docks in the main window (two at the bottom (or top), two at left (or right))
*Compile and start the app
*Drag the docks from the bottom such that they stacked above each other
*Drag the docks from left such that they are side by side
*Now drag each of the drag handles to change the space amount between the docks and see what happens.