Canvas SizeChanged is not triggered when it is inside another Canvas

[cnbluefire]

Describe the bug
When modifying the width and height of the Canvas, If it's directly in another Canvas, ActualWidth and ActualHeight will change but SizeChanged is not triggered.

Steps to reproduce the bug
like this: https://github.com/cnbluefire/CanvasSizeChangedTest

Expected behavior
When a control's width and height change, it should trigger SizeChanged

Version Info

NuGet package version:

Windows 10 version	Saw the problem?
Insider Build (xxxxx)
May 2020 Update (19041)
November 2019 Update (18363)
May 2019 Update (18362)
October 2018 Update (17763)	Yes
April 2018 Update (17134)
Fall Creators Update (16299)
Creators Update (15063)

Device form factor	Saw the problem?
Desktop	Yes
Xbox
Surface Hub
IoT

Additional context

[michael-hawker]

I was also noticing that if an element within the Canvas is moved (via Canvas.Top or Canvas.Left) that element's LayoutUpdated event isn't fired. So I don't think there's a way for the element to detect that it's moved either... I think that'd be a separate bug though. maybe? Definitely seems related in some ways. @ranjeshj know if that's the expected behavior or not?

[michael-hawker]

Related to #674

[github-actions]

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