Fix snap back behavior for a quote mark input.

            if (!isSpaceCharacter(code) && code >= 0) {

                mSwitchState = SWITCH_STATE_SYMBOL;

            }

            // Snap back to alpha keyboard mode immediately if user types a quote character.

            if (isQuoteCharacter(code)) {

                changeKeyboardMode();

            }

            break;

        case SWITCH_STATE_SYMBOL:

        case SWITCH_STATE_CHORDING_SYMBOL:

            // Snap back to alpha keyboard mode if user types one or more non-space/enter

            // characters followed by a space/enter or quotation mark.

            // characters followed by a space/enter or a quote character.

            if (isSpaceCharacter(code) || isQuoteCharacter(code)) {

                changeKeyboardMode();

            }