Windows 10, IE 11
* Start drag on control bar handle.
* Drag over canvas.
* Observe that the cursor disappears and does not reappear until mouse is released.
Not an regression, same beheaviour on 4.10.1 (eudemo).
This is a variation on bug 7403 with the order reversed.
Also verified that this behavior was the same before the changes that were made for bug 5779 with commit r34504.