modification for 'add md file' tip in 'repo wiki mode' & etc. (#2759)

frontend/src/components/dirent-list-view/dirent-list-view.js

@@ -16,9 +16,9 @@ const propTypes = {
   isAllItemSelected: PropTypes.bool.isRequired,
   isDirentListLoading: PropTypes.bool.isRequired,
   direntList: PropTypes.array.isRequired,
-  sortBy: PropTypes.string,
-  sortOrder: PropTypes.string,
-  sortItems: PropTypes.func,
+  sortBy: PropTypes.string.isRequired,
+  sortOrder: PropTypes.string.isRequired,
+  sortItems: PropTypes.func.isRequired,
   onAddFile: PropTypes.func.isRequired,
   onItemDelete: PropTypes.func.isRequired,
   onAllItemSelected: PropTypes.func.isRequired,

frontend/src/css/tip-for-new-md.css

@@ -1,5 +1,6 @@
 .tip-for-new-md {
   padding: 5em 8em; 
+  align-self: flex-start; /* for repo wiki mode */
 }
 .big-new-md-button {
   padding: .9em 2em 1em; 

frontend/src/pages/repo-wiki-mode/main-panel.js

@@ -271,6 +271,7 @@ class MainPanel extends Component {
                         sortBy={this.props.sortBy}
                         sortOrder={this.props.sortOrder}
                         sortItems={this.props.sortItems}
+                        onAddFile={this.props.onAddFile}
                         onItemClick={this.onItemClick}
                         onItemDelete={this.props.onItemDelete}
                         onItemRename={this.props.onItemRename}