Merge "Fixed flicker when docking task from recents." into nyc-dev

    private boolean shouldBeVisible(ActivityRecord r, boolean behindTranslucentActivity,

            boolean stackVisibleBehind, ActivityRecord visibleBehind,

            boolean behindFullscreenActivity) {

        // mLaunchingBehind: Activities launching behind are at the back of the task stack

        // but must be drawn initially for the animation as though they were visible.

        final boolean activityVisibleBehind =

                (behindTranslucentActivity || stackVisibleBehind) && visibleBehind == r;

        if (!okToShowLocked(r)) {

            return false;

        }

        // mLaunchingBehind: Activities launching behind are at the back of the task stack

        // but must be drawn initially for the animation as though they were visible.

        final boolean activityVisibleBehind =

                (behindTranslucentActivity || stackVisibleBehind) && visibleBehind == r;

        boolean isVisible =

                !behindFullscreenActivity || r.mLaunchTaskBehind || activityVisibleBehind;

        if (isVisible && r.isRecentsActivity()) {

            // Recents activity can only be visible if the home stack isn't fullscreen or is the

            // focused stack.

            isVisible = !mFullscreen || mStackSupervisor.isFocusedStack(this);

            // Recents activity can only be visible if the home stack is the focused stack or we are

            // in split-screen mode.

            isVisible = mStackSupervisor.getStack(DOCKED_STACK_ID) != null

                    || mStackSupervisor.isFocusedStack(this);

        }

        return isVisible;