Merge "Hide leash at beginning of animation instead of alpha"

        @Override

        public void startAnimation(SurfaceControl animationLeash, Transaction t,

                OnAnimationFinishedCallback finishCallback) {

            // TODO: use 0 alpha and remove t.hide() once b/138459974 is fixed.

            t.setAlpha(animationLeash, 1 /* alpha */);

            t.hide(animationLeash);

            mCapturedLeash = animationLeash;

            final Rect frame = mWin.getWindowFrames().mFrame;

            t.setPosition(mCapturedLeash, frame.left, frame.top);