message: Use accessible button for copy icon.
diff: @@ -30,6 +30,7 @@ import * as ContextMenu from "../../structures/ContextMenu";
  import {toRightOf} from "../../structures/ContextMenu";
  import {copyPlaintext, selectText} from "../../../utils/strings";
  import StyledCheckbox from '../elements/StyledCheckbox';
  +import AccessibleTooltipButton from '../elements/AccessibleTooltipButton';
  const socials = [
  {
  @@ -210,9 +211,11 @@ export default class ShareDialog extends React.PureComponent<IProps, IState> {
  >
  { matrixToUrl }
  </a>
  - <a href={matrixToUrl} className="mx_ShareDialog_matrixto_copy" onClick={this.onCopyClick}>
  - <div>&nbsp;</div>
  - </a>
  + <AccessibleTooltipButton
  + title={_t("Copy")}
  + onClick={this.onCopyClick}
  + className="mx_ShareDialog_matrixto_copy"
  + />
  </div>
  { checkbox }
  <hr />
  