dennisdoomen / fluentassertions / 24307980083

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Cache Node.Depth to avoid repeated string scanning

Node.Depth previously computed the depth on every call by counting '.' characters
in Subject.PathAndName using LINQ. This method is called in ShouldContinueThisDeep
for every AssertEquivalencyOf invocation, meaning it runs thousands of times during
a typical structural comparison.

The result is now memoised in a private int field (initialised to -1) and
recomputed only when AdjustForRemappedSubject changes the underlying path.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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