Merge "Desks: Do not assume a desk exists when checking for tiled tasks" into main

    /** Gets a registered left tiled task to desktop state or returns null. */

    fun getLeftTiledTask(displayId: Int): Int? {

        logD("getLeftTiledTask for displayId=%d", displayId)

        val activeDesk =

            checkNotNull(desktopData.getDefaultDesk(displayId)) {

                "Expected desk in display: $displayId"

            }

        val deskId = activeDesk.deskId

        val desk = checkNotNull(desktopData.getDesk(deskId)) { "Did not find desk: $deskId" }

        return desk.leftTiledTaskId

        return desktopData.getActiveDesk(displayId)?.leftTiledTaskId

    }

    /** gets a registered right tiled task to desktop state or returns null. */

    fun getRightTiledTask(displayId: Int): Int? {

        logD("getRightTiledTask for displayId=%d", displayId)

        val activeDesk =

            checkNotNull(desktopData.getDefaultDesk(displayId)) {

                "Expected desk in display: $displayId"

            }

        val deskId = activeDesk.deskId

        val desk = checkNotNull(desktopData.getDesk(deskId)) { "Did not find desk: $deskId" }

        return desk.rightTiledTaskId

        return desktopData.getActiveDesk(displayId)?.rightTiledTaskId

    }

    /* Unregisters a left tiled task from desktop state. */