hbStarted Library Method
Short Description: Check if transition has been started
Signature: t.hbStarted ()
Class: transition Class
The method returns true, if start was already called for this transition in
the current animation. If an animation terminated automatically a new empty
animation is created, having initially no transitions.
New transitions can be defined and added as usual and also
old transitions (of a previouly run animation) can be added by calling start a second time.
hbstarted becomes false if the animation terminated and
start needs to be called to incorporate the transition into the
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