old_contents: import React from 'react';
  import PropTypes from 'prop-types';
  import classNames from 'classnames';
  import withStyles from '../styles/withStyles';
  
  export const styles = theme => {
    const spacing = theme.spacing.unit * 3;
    return {
      root: {
        flex: '1 1 auto',
        overflowY: 'auto',
        padding: `0 ${spacing}px ${spacing}px ${spacing}px`,
        '&:first-child': {
          paddingTop: spacing,
        },
      },
    };
  };
  
  function DialogContent(props) {
    const { classes, children, className, ...other } = props;
  
    return (
      <div className={classNames(classes.root, className)} {...other}>
        {children}
      </div>
    );
  }
  
  DialogContent.propTypes = {
    /**
     * The content of the component.
     */
    children: PropTypes.node,
    /**
     * Useful to extend the style applied to components.
     */
    classes: PropTypes.object.isRequired,
    /**
     * @ignore
     */
    className: PropTypes.string,
  };
  
  export default withStyles(styles, { name: 'MuiDialogContent' })(DialogContent);
  
new_contents: import React from 'react';
  import PropTypes from 'prop-types';
  import classNames from 'classnames';
  import withStyles from '../styles/withStyles';
  
  export const styles = theme => {
    const spacing = theme.spacing.unit * 3;
    return {
      root: {
        flex: '1 1 auto',
        overflowY: 'auto',
        WebkitOverflowScrolling: 'touch', // Add iOS momentum scrolling.
        padding: `0 ${spacing}px ${spacing}px ${spacing}px`,
        '&:first-child': {
          paddingTop: spacing,
        },
      },
    };
  };
  
  function DialogContent(props) {
    const { classes, children, className, ...other } = props;
  
    return (
      <div className={classNames(classes.root, className)} {...other}>
        {children}
      </div>
    );
  }
  
  DialogContent.propTypes = {
    /**
     * The content of the component.
     */
    children: PropTypes.node,
    /**
     * Useful to extend the style applied to components.
     */
    classes: PropTypes.object.isRequired,
    /**
     * @ignore
     */
    className: PropTypes.string,
  };
  
  export default withStyles(styles, { name: 'MuiDialogContent' })(DialogContent);
  
subject: Fix iOS momentum scroll (#11066)