src/vs/workbench/browser/parts/views/viewPane.ts/ViewWelcomeController/constructor
class ViewWelcomeController:	constructor(
		private id: string,
		@IContextKeyService private contextKeyService: IContextKeyService,
	) {
		contextKeyService.onDidChangeContext(this.onDidChangeContext, this, this.disposables);
		Event.filter(viewsRegistry.onDidChangeViewWelcomeContent, id => id === this.id)(this.onDidChangeViewWelcomeContent, this, this.disposables);
		this.onDidChangeViewWelcomeContent();
	}