lib/model: Detect deleted RO items scanning on non-RO (fixes #6864) #6865
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The main change is fixing #6864 by checking on unchanged deleted items if the local flags changed and adjusting accordingly. Also resolving deleted, receive-only items that no-one else had was convoluted (and potentially resulted in duplicate db updates, which shouldn't do any harm though), so I refactored that too. And there's a unit test for #6864).