[Fix] 110 Unchecking BeginAtZero Resets Chart

[Conundraah]

• fixed a bug in Chart.razor.cs

[Apollo3zehn]

If the chart is only re-rendered when BeginAtZero equals true it will not be re-rendered when the user unchecks the checkbox while no zoom is being applied. But in that case (no zoom applied) it must re-render.

So I think it is necessary to check if _zoomBox equals new SKRect(0, 0, 1, 1);. Since it is a struct (= value type), the following should work:

if (_zoomBox == new SKRect(0, 0, 1, 1))

To make it a bit prettier we could define a class variable like private static readonly _defaultZoomBox = new SKRect(0, 0, 1, 1) (or maybe constant instead of static readonly) and then reuse that one in the if (x == y) statement as well as here:

nexus/src/Nexus.UI/Charts/Chart.razor.cs

Lines 526 to 527 in 5acb50d

	_oldZoomBox = new SKRect(0, 0, 1, 1);
	_zoomBox = new SKRect(0, 0, 1, 1);