Usings inside namespace bug

[leblocks]

Namespace info is not being saved for files where usings defined inside namespace:

For example:

// Source - https://stackoverflow.com/a/16092975
// Posted by Jeppe Stig Nielsen, modified by community. See post 'Timeline' for change history
// Retrieved 2026-02-14, License - CC BY-SA 4.0

namespace MyCorp.TheProduct.SomeModule.Utilities
{
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using MyCorp.TheProduct;                           // MyCorp can be left out; this using is NOT redundant
    using MyCorp.TheProduct.OtherModule;               // MyCorp.TheProduct can be left out
    using MyCorp.TheProduct.OtherModule.Integration;   // MyCorp.TheProduct can be left out
    using ThirdParty;

    class C
    {
        Ambiguous a;
    }
}

Bonus - check if definitions provider handles such case correctly