Prevent AutoLayout from causing an invalidation loop on WinUI #1138
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Fixes #1131
Bugfix
What is the current behavior?
In some situations, it was possible to crash the UI in WinUI, launching an invalidation loop.
What is the new behavior?
Now works properly on both WinUI and Uno. Child elements are not remeasured during arrange phase, we're just using their desired size to layout them.
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