am 166ebd4d: De-parent custom content view before adding to custom content screen

        if (customContent instanceof Insettable) {

            ((Insettable)customContent).setInsets(mInsets);

        }

        // Verify that the child is removed from any existing parent.

        if (customContent.getParent() instanceof ViewGroup) {

            ViewGroup parent = (ViewGroup) customContent.getParent();

            parent.removeView(customContent);

        }

        customScreen.removeAllViews();

        customScreen.addViewToCellLayout(customContent, 0, 0, lp, true);

        mCustomContentDescription = description;