src/vs/workbench/contrib/scm/browser/scmViewPane.ts/ViewModel/treeViewState
class ViewModel:	get treeViewState(): ITreeViewState | undefined {
		if (this.visible && this._treeViewStateIsStale) {
			this.updateViewState();
			this._treeViewStateIsStale = false;
		}

		return this._treeViewState;
	}