Merge "Support device without desktop wallpaper" into main

        verifyActivityState(browserApp, WINDOWING_MODE_FREEFORM, DEFAULT_DISPLAY, visible = true)

        verifyActivityState(clockApp, WINDOWING_MODE_FULLSCREEN, DEFAULT_DISPLAY, visible = false)

        // Open overview. If the device is not expected to have DesktopWallpaperActivity (i.e.,

        // `shouldShowHomeBehindDesktop` is true), we here use `tapl.workspace` because

        // `tapl.launchedAppState` expects any fullscreen app is visible and `tapl.workspace`

        // expects no fullscreen app is visible.

        val overview = if (desktopState.shouldShowHomeBehindDesktop) {

            tapl.workspace.openOverviewFromActionPlusTabKeyboardShortcut()

        } else tapl.launchedAppState.switchToOverview()

        // Verify the overview has both the fullscreen app and the desktop.

        val overview = tapl.launchedAppState.switchToOverview()

        overview.flingBackward()

        assertTrue("Can't find a desktop overview item", overview.currentTask.isDesktop)

        overview.flingForward()