Merge remote-tracking branch 'origin/master' into pr/lmvco/88536

src/vs/platform/list/browser/listService.ts

@@ -58,18 +58,23 @@ export class ListService implements IListService {
 	private disposables = new DisposableStore();
 	private lists: IRegisteredList[] = [];
 	private _lastFocusedWidget: ListWidget | undefined = undefined;
+	private _hasCreatedStyleController: boolean = false;
 
 	get lastFocusedList(): ListWidget | undefined {
 		return this._lastFocusedWidget;
 	}
 
-	constructor(@IThemeService themeService: IThemeService) {
-		// create a shared default tree style sheet for performance reasons
-		const styleController = new DefaultStyleController(createStyleSheet(), '');
-		this.disposables.add(attachListStyler(styleController, themeService));
+	constructor(@IThemeService private readonly _themeService: IThemeService) {
 	}
 
 	register(widget: ListWidget, extraContextKeys?: (IContextKey<boolean>)[]): IDisposable {
+		if (!this._hasCreatedStyleController) {
+			this._hasCreatedStyleController = true;
+			// create a shared default tree style sheet for performance reasons
+			const styleController = new DefaultStyleController(createStyleSheet(), '');
+			this.disposables.add(attachListStyler(styleController, this._themeService));
+		}
+
 		if (this.lists.some(l => l.widget === widget)) {
 			throw new Error('Cannot register the same widget multiple times');
 		}