On my system, when selecting a state and then using control + space, the content assist does not work. Instead, the state gets selected with a blue border, and the properties view jumps to the statechart's properties. Ctrl + Space works fine everywhere else.
I can confirm that you need to press Ctrl-Space twice for the graphical content assist.
This is different from the normal behavior and confusing for the user.
On my system, when selecting a state and then using control + space, the content assist does not work. Instead, the state gets selected with a blue border, and the properties view jumps to the statechart's properties. Ctrl + Space works fine everywhere else.
@tkutz please verify