Add "showLoading" option to tree to allow trees to opt out of the loading...

Add "showLoading" option to tree to allow trees to opt out of the loading indicator, since setTimeout/clearTimeout has a large perf impact

src/vs/base/parts/tree/browser/tree.ts

@@ -687,6 +687,7 @@ export interface ITreeOptions extends ITreeStyles {
 	ariaLabel?: string;
 	keyboardSupport?: boolean;
 	preventRootFocus?: boolean;
+	showLoading?: boolean;
 }
 
 export interface ITreeStyler {

src/vs/base/parts/tree/browser/treeImpl.ts

@@ -92,6 +92,7 @@ export class Tree implements _.ITree {
 		options.alwaysFocused = options.alwaysFocused === true ? true : false;
 		options.useShadows = options.useShadows === false ? false : true;
 		options.paddingOnRow = options.paddingOnRow === false ? false : true;
+		options.showLoading = options.showLoading === false ? false : true;
 
 		this.context = new TreeContext(this, configuration, options);
 		this.model = new Model.TreeModel(this.context);

src/vs/base/parts/tree/browser/treeView.ts

@@ -867,7 +867,7 @@ export class TreeView extends HeightMap {
 		var item = <Model.Item>e.item;
 		var viewItem = this.items[item.id];
 
-		if (viewItem) {
+		if (viewItem && this.context.options.showLoading) {
 			viewItem.loadingTimer = setTimeout(() => {
 				viewItem.loadingTimer = 0;
 				viewItem.loading = true;

src/vs/workbench/parts/search/browser/searchView.ts

@@ -554,7 +554,8 @@ export class SearchView extends Viewlet implements IViewlet, IPanel {
 				accessibilityProvider: this.instantiationService.createInstance(SearchAccessibilityProvider),
 				dnd
 			}, {
-					ariaLabel: nls.localize('treeAriaLabel', "Search Results")
+					ariaLabel: nls.localize('treeAriaLabel', "Search Results"),
+					showLoading: false
 				});
 
 			this.tree.setInput(this.viewModel.searchResult);