[v2.0.0-rc6.1][Avalonia] When the chart background is set to transparent, the transparent area directly penetrates to the desktop.

[1072643169]

When the chart background is set to transparent, the transparent area directly penetrates to the desktop, ignoring the contents of the lower controls and windows. I don't think this is in line with common usage habits and needs.

In gif(7.3mb)(5.3mb), observe the actual rendering under different conditions by adjusting the background color of the window and chart.

Through debugging, the cause of the problem is “Canvas.Clear(Background)“ in the ”SkiaSharpDrawingContext.OnBeginDraw()” method，The default layer connects directly to the underlying operating system。If “Canvas.SaveLayer()” is executed before then，"Clear()" will only affect new layers。

[MajesticBevans]

Just noting here that I'm having a likely related issue where an opacity of 0 just shows a black background, regardless of which control is behind the chart. Also on Avalonia rc6.1

[beto-rodriguez]

Thanks for the fix! this will be included in the next versions of the library.