foreground Library Method
Short Description: Keep animation canvas in foreground during transition
Signature: t.foreground ()
Class: transition Class
Is used during Background Mode to control the position of the main canvas
playing the animation. If foreground was called for a transition,
the canvas is pulled into foreground, while the transition is playing.
The canvas moves to background while none of the playing transitions
Note that if background mode is not explicitely activated using BgControl
animations play in foreground without the need of foreground.
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