src/vs/editor/contrib/anchorSelect/browser/anchorSelect.ts/SelectionAnchorController/constructor
class SelectionAnchorController:	constructor(
		private editor: ICodeEditor,
		@IContextKeyService contextKeyService: IContextKeyService
	) {
		this.selectionAnchorSetContextKey = SelectionAnchorSet.bindTo(contextKeyService);
		this.modelChangeListener = editor.onDidChangeModel(() => this.selectionAnchorSetContextKey.reset());
	}