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| Function: | ComposeTransition | (trans, before=None, after=None): |
This allows transitions to be composed before they are applied.
trans - The top-level transition.
before - If not None, a transition that is applied to the old and new screens, and used as the old screen for trans.
after - If not None, a transition that is applied to the old and new screens, and used as the new screen for trans.
This may not work with all transitions.
$ moveinoutdissolve = ComposeTransition(dissolve, before=moveoutleft, after=moveinright)