Code action to open namespace inserts declaration at wrong location when no other opens present

[cgranade]

Describe the bug

When using a code action to add a missing open declaration to a source file that does not yet contain any open statements (including Microsoft.Quantum.Intrinsic), the new open declaration is included at the wrong location.

To Reproduce

Start with the following source file:

namespace Microsoft.Quantum.Arrays {

    /// # Summary
    function All<'T> (predicate : ('T -> Bool), array : 'T[]) : Bool {
       return Fold(And, true, Mapped(predicate, array));
    }

}

Select the available code action at And to obtain:

namespace Microsoft.Quantum.Arrays {

    /// # Summary
    open Microsoft.Quantum.Logical;

    function All<'T> (predicate : ('T -> Bool), array : 'T[]) : Bool {
       return Fold(And, true, Mapped(predicate, array));
    }

}

Expected behavior

namespace Microsoft.Quantum.Arrays {
    open Microsoft.Quantum.Logical;

    /// # Summary
    function All<'T> (predicate : ('T -> Bool), array : 'T[]) : Bool {
       return Fold(And, true, Mapped(predicate, array));
    }

}

System information

• Version of the NuGet package or extension for which the problem occurs: 0.11.2003.2506
• Your operating system and .NET Core version: Windows 10, .NET Core SDK 5.0.100-preview.1.20155.7
• For issues with extensions, the version of the IDE for which the problem occurs: VS Code 1.43.2.

[bettinaheim]

That's a good candidate for a bug bash...