show (+) widget on hover instead of on selection

[bltzr]

for states and constraints

[jcelerier]

To do

Constraint :

Currently, the overlay is shown in ConstraintView::setSelected.
This should be changed so that it is shown on hoverEnterEvent and hidden on hoverLeaveEvent.

State

Currently, the overlay is shown in StateView::setSelected.
Likewise, it should be shown on the same methods (from QGraphicsItem) than ConstraintView.

[bltzr]

This does'nt seem to be working on states, only on intervals (v2.2, from the downloaded release)