repair scroll bug&file padding bug (#2976)

frontend/src/css/lib-content-view.css

@@ -146,7 +146,6 @@
 
 .cur-view-content .wiki-page-content {
   flex: 1;
-  padding-right: 40px;
 }
 
 .dir-content-main .wiki-page-content .article {

frontend/src/pages/lib-content-view/lib-content-container.js

@@ -142,7 +142,7 @@ class LibContentContainer extends React.Component {
               onPathClick={this.onPathClick}
             />
           </div>
-          <div className="cur-view-content view-mode-container">
+          <div className={`cur-view-content ${this.props.currentMode === 'column' ? 'view-mode-container' : ''}`}>
             {!this.props.pathExist && this.errMessage}
             {this.props.pathExist && (
               <Fragment>

frontend/src/pages/lib-content-view/lib-content-view.js

@@ -524,6 +524,7 @@ class LibContentView extends React.Component {
     }
     
     this.setState({currentMode: mode});
+    this.showDir(path);
   }
 
   onSearchedClick = (item) => {