src/vs/editor/browser/widget/codeEditorWidget.ts/CodeEditorWidget/changeViewZones
class CodeEditorWidget:	public changeViewZones(callback: (accessor: editorBrowser.IViewZoneChangeAccessor) => void): void {
		if (!this._modelData || !this._modelData.hasRealView) {
			return;
		}
		this._modelData.view.change(callback);
	}