Add void Post(Action<object> action,object arg, DispatcherPriority priority = default);

[workgroupengineering]

In commit 4ec36c9 of PR #8021 are remove generic methods from IDispatcher.
Post was added in PR #6527 to avoid closures in intense operations such as:

Avalonia/src/Avalonia.Visuals/Rendering/RenderLoop.cs

Lines 112 to 136 in 3e3396d

	if (needsUpdate &&
	Interlocked.CompareExchange(ref _inUpdate, 1, 0) == 0)
	{
	_dispatcher.Post(() =>
	{
	for (var i = 0; i < _items.Count; ++i)
	{
	var item = _items[i];
	if (item.NeedsUpdate)
	{
	try
	{
	item.Update(time);
	}
	catch (Exception ex)
	{
	Logger.TryGet(LogEventLevel.Error, LogArea.Visual)?.Log(this, "Exception in render update: {Error}", ex);
	}
	}
	}
	Interlocked.Exchange(ref _inUpdate, 0);
	}, DispatcherPriority.Render);
	}

I would like to propose you to add the non-generic version which accepts an argument of type object.

[maxkatz6]

It was done #8304