STL checks in advance whether the userAction is supported.

STL does not support transition to the same scene. In this case we throw
 an exception as soon as the user action is not valid.

Test: atest SceneTransitionLayoutTest
Bug: 333939922
Flag: NA
Change-Id: Ib84d84d7ee2db548d76bcfcf1a3f6df368fa46ba
2 files changed