Stopgap solution for a crash.

        // the text field, then we can return the cached version right away.

        if (cachedLength >= n || cachedLength >= mExpectedCursorPosition) {

            final StringBuilder s = new StringBuilder(mCommittedTextBeforeComposingText);

            s.append(mComposingText);

            // We call #toString() here to create a temporary object.

            // In some situations, this method is called on a worker thread, and it's possible

            // the main thread touches the contents of mComposingText while this worker thread

            // is suspended, because mComposingText is a StringBuilder. This may lead to crashes,

            // so we call #toString() on it. That will result in the return value being strictly

            // speaking wrong, but since this is used for basing bigram probability off, and

            // it's only going to matter for one getSuggestions call, it's fine in the practice.

            s.append(mComposingText.toString());

            if (s.length() > n) {

                s.delete(0, s.length() - n);

            }