Nullability checks for ShellPageRendererTracker #27160
Open
+194
−107
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Description of Change
This contains all the code fixes made to #27159 but we can't modify the public nullability of this file until .NET 10
These changes were motivated by the following PR #26786
We modified the ViewController property to be a weak reference so we need to account for scenarios where it might become null without us realizing it.
Follow up work here #27162