[v1.5] Fix LWWDictionary.Delta ArgumentNullException when underlying delta is null #7912
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…s null (akkadotnet#7910) (akkadotnet#7911) ## Summary Fixed a bug where LWWDictionary.Delta would throw ArgumentNullException when the underlying ORDictionary.Delta is null, which is a legitimate state after initialization or calling ResetDelta(). ## Changes - Modified LWWDictionary.Delta property to return null when Underlying.Delta is null - Added test Bugfix_7910_LWWDictionary_Delta_should_handle_null_underlying_delta to verify the fix ## Root Cause The LWWDictionary.Delta property was unconditionally wrapping Underlying.Delta in a LWWDictionaryDelta constructor, which throws ArgumentNullException when passed null. However, ORDictionary.Delta can legitimately return null after construction or ResetDelta(). The Replicator expects deltas to be nullable (uses ?? operator at lines 665 and 685), so this fix aligns LWWDictionary with the expected interface contract. Fixes akkadotnet#7910
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Summary
Backport of #7911 to v1.5 branch.
Fixed a bug where
LWWDictionary.Deltawould throwArgumentNullExceptionwhen the underlyingORDictionary.Deltaisnull, which is a legitimate state after initialization or callingResetDelta().Changes
LWWDictionary.Deltaproperty to returnnullwhenUnderlying.DeltaisnullBugfix_7910_LWWDictionary_Delta_should_handle_null_underlying_deltato verify the fixRoot Cause
The
LWWDictionary.Deltaproperty was unconditionally wrappingUnderlying.Deltain aLWWDictionaryDeltaconstructor, which throwsArgumentNullExceptionwhen passednull. However,ORDictionary.Deltacan legitimately returnnullafter construction orResetDelta().The Replicator expects deltas to be nullable (uses
??operator), so this fix alignsLWWDictionarywith the expected interface contract.Test Evidence
All
LWWDictionarySpectests pass:Fixes #7910 for v1.5