Reduce calls to refresh tree to one call

src/vs/workbench/parts/explorers/browser/treeExplorerViewlet.ts

@@ -40,8 +40,6 @@ export class TreeExplorerViewlet extends Viewlet {
 		this.viewletContainer = parent.div().addClass('custom-viewlet');
 		this.addTreeView('Tree1');
 
-		this.setVisible(true).then(() => this.focus());
-
 		const settings = this.configurationService.getConfiguration<ICustomViewletConfiguration>();
 		return this.onConfigurationUpdated(settings);
 	}

src/vs/workbench/parts/explorers/browser/views/treeView.ts

@@ -68,7 +68,6 @@ export class TreeView extends CollapsibleViewletView {
 		DOM.addClass(this.treeContainer, 'tree-explorer-viewlet-tree-view');
 
 		this.tree = this.createViewer($(this.treeContainer));
-		this.updateInput();
 	}
 
 	getActions(): IAction[] {
@@ -96,7 +95,7 @@ export class TreeView extends CollapsibleViewletView {
 	}
 
 	create(): TPromise<void> {
-		return this.setVisible(true);
+		return TPromise.as(null);
 	}
 
 	setVisible(visible: boolean): TPromise<void> {