Merge "Prevent crash for Span change events"

        public void onSpanChanged(Spannable s, Object o, int start, int end, int nstart, int nend) {

            if (o instanceof UpdateLayout) {

                if (start > end) {

                    // Bug: 67926915 start cannot be determined, fallback to reflow from start

                    // instead of causing an exception

                    start = 0;

                }

                reflow(s, start, end - start, end - start);

                reflow(s, nstart, nend - nstart, nend - nstart);

            }