The movement of the handle between two QDockWidgets is not synchronized with the mouse movement (the handle moves faster).
I got this problem since Qt 4.6, never happened with 4.5.x.
I attached a file where you can see the bug.
How to reproduce:
- Drag the handle between the two dock widgets: it should follow the mouse correctly
- Now drag one of the dock widgets in another position
- From now on the handle no longer follows the mouse position but it moves faster