explorer: refresh icon not showing

src/vs/workbench/contrib/files/browser/fileActions.ts

@@ -827,7 +827,7 @@ export class RefreshExplorerView extends Action {
 		@IViewletService private readonly viewletService: IViewletService,
 		@IExplorerService private readonly explorerService: IExplorerService
 	) {
-		super(id, label, 'explorer-action ' + Codicon.refresh);
+		super(id, label, 'explorer-action ' + Codicon.refresh.classNames);
 		this._register(explorerService.onDidChangeEditable(e => {
 			const elementIsBeingEdited = explorerService.isEditable(e);
 			this.enabled = !elementIsBeingEdited;