fix: History sidebar header shrinking when lots of history

app/components/DocumentHistory/DocumentHistory.js

@@ -193,6 +193,7 @@ const Header = styled(Flex)`
   padding: 12px;
   border-bottom: 1px solid ${(props) => props.theme.divider};
   color: ${(props) => props.theme.text};
+  flex-shrink: 0;
 `;
 
 export default inject("documents", "revisions")(DocumentHistory);

app/components/DocumentHistory/components/Revision.js

@@ -36,7 +36,7 @@ class RevisionListItem extends React.Component<Props> {
           {revision.createdBy.name}
         </Author>
         <Meta>
-          <Time dateTime={revision.createdAt}>
+          <Time dateTime={revision.createdAt} tooltipDelay={250}>
             {format(revision.createdAt, "MMMM Do, YYYY h:mm a")}
           </Time>
         </Meta>