Refactoring suggestion: remove using

[miloush]

Summary

This is a proposal to introduce a refactoring to remove using, i.e. all the types from the used namespace would get fully qualified (or as needed regarding to other imported namespaces).

Background and Motivation

Namespaces refactoring can lead to this operation. Another use case is trying to use a type conflicting with one currently used but from different namespace. You cannot use both namespaces but you don't want to favoritize any.

Proposed Feature

Setup:

namespace MyNamespace.Area1 { class MyClass {} }
namespace MyNamespace.Area2 { class MyClass {} }

Before refactoring:

using MyNamespace.Area1;

namespace MyNamespace
{
    class Foo : MyClass { }
}

After refactoring to remove using MyNamespace.Area1:

namespace MyNamespace
{
    class Foo : Area1.MyClass { }
}

Now class Boo : Area2.MyClass can be added without conflict.

Note that this is difficult to do manually because "fully qualify" quick fix cannot be applied file-wise.