Merge "Prevent exception when quick switching between two split pairs" into udc-dev

                    throw new IllegalStateException(

                            "Expected task to be showing, but it is " + mode);

                }

                if (change.getParent() == null) {

                    throw new IllegalStateException("Initiating multi-split launch but the split"

                            + "root of " + taskId + " is already visible or has broken hierarchy.");

                }

            }

            if (taskId == initialTaskId) {

                splitRoot1 = transitionInfo.getChange(change.getParent());

                splitRoot1 = change.getParent() == null ? change :

                        transitionInfo.getChange(change.getParent());

            }

            if (taskId == secondTaskId) {

                splitRoot2 = transitionInfo.getChange(change.getParent());

                splitRoot2 = change.getParent() == null ? change :

                        transitionInfo.getChange(change.getParent());

            }

        }