public Task SaveSolutionExplorerNodeStates(ISolutionManager solutionManager)
{
if (solutionManager == null)
{
throw new ArgumentNullException(nameof(solutionManager));
}
return(NuGetUIThreadHelper.JoinableTaskFactory.Run(async delegate
{
await NuGetUIThreadHelper.JoinableTaskFactory.SwitchToMainThreadAsync();
_expandedNodes = await VsHierarchyUtility.GetAllExpandedNodesAsync(solutionManager);
return Task.CompletedTask;
}));
}