Merge "DesktopMixed: check we have no valid changes if launch change is null" into main

        finishTransaction: SurfaceControl.Transaction,

        finishCallback: TransitionFinishCallback,

    ): Boolean {

        val launchChange = findDesktopTaskChange(info, pending.launchingTask)

        if (launchChange == null) {

            logV("No launch Change, returning")

            return false

        }

        // Check if there's also an immersive change during this launch.

        val immersiveExitChange = pending.exitingImmersiveTask?.let { exitingTask ->

            findDesktopTaskChange(info, exitingTask)

        val minimizeChange = pending.minimizingTask?.let { minimizingTask ->

            findDesktopTaskChange(info, minimizingTask)

        }

        val launchChange = findDesktopTaskChange(info, pending.launchingTask)

        if (launchChange == null) {

            check(minimizeChange == null)

            check(immersiveExitChange == null)

            logV("No launch Change, returning")

            return false

        }

        var subAnimationCount = -1

        var combinedWct: WindowContainerTransaction? = null