Fix off-thread InvalidatePlot calls (47)

oxyplot / oxyplot-avalonia

A cross-platform plotting library for .NET. This package targets Avalonia apps.

https://oxyplot.github.io/

MIT License

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Closed VisualMelon closed 2 years ago

VisualMelon commented 2 years ago

Fixes various threading issues discovered while investigating #47

BeginInvoke was backwards
Not locking when updating/rendering
Not ensuring Update is called before Render if invalidated (this was the issue causing the exact behaviour observed in #47)

Been a while since I wrote this sort of stuff, so could really do with a second pair of eyes.