Tests hit testing in Layers3DView
Initial state
State of layers:
hovered layer: none
selected layer: content root
Hovering content root
State of layers:
hovered layer: none
selected layer: content root
Selecting layer b
State of layers:
hovered layer: none
selected layer: layer b
Hovering layer a
State of layers:
hovered layer: layer a
selected layer: layer b
Selecting content root
State of layers:
hovered layer: none
selected layer: content root