Check canRetainCheck when saving RetainedStateRegistry #1276
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This is mostly @alexvanyo's work from #1253. Unfortunately I couldn't find a way for a PR from a fork to be based on another PR from a different fork.
My changes add the relevant fixes to make sure that saved/restored back stacks (aka back stacks) work with the changes. Primarily this is so that we check both the current back stack and saved backstacks when determining whether we can retain state.
Fixes #1252