Merge "Fixed flicker on activity transition in docked stack."

    @Override

    boolean isVisible() {

        if (hidden) {

            // TODO: Should this be checking hiddenRequested instead of hidden?

            return false;

        }

        return super.isVisible();

        // If the app token isn't hidden then it is considered visible and there is no need to check

        // its children windows to see if they are visible.

        return !hidden;

    }

    @Override

    @Override

    boolean isVisible() {

        if ((mAppToken == null || !mAppToken.hiddenRequested) && isVisibleUnchecked()) {

        // TODO: The check for hiddenRequested is commented out below, because the window can still

        // be visible on screen when the flag is true. We would like the isVisible() method to

        // return an answer closer to if the window is truly visible (can't be an exact answer

        // without checking the surface state), so comment out the check for now so we can test to

        // see what problem it causes.

        // If it doesn't cause any issues, then we can remove just before we lock down the current

        // release (O) and also consolidate this method with #isVisibleUnchecked() and possibly

        // other methods like isVisibleNow().

        // If it does cause problems, then we can look if there are other ways to solve the problem.

        // If there isn't then uncomment and document here why it is needed.

        if (/*(mAppToken == null || !mAppToken.hiddenRequested) && */isVisibleUnchecked()

            // TODO: The window isn't considered visible when the token is hidden, however

            // uncommenting the check below breaks the visual transition from an app to the launcher

            // if the home buttons is pressed. Need to investigate an fix that issue before

            // uncommenting.

            /* && !mToken.hidden*/) {

            // Is this window visible?  It is not visible if there is no surface, or we are in the

            // process of running an exit animation that will remove the surface, or its app token

            // has been hidden.