Create Declaration / Definition incorrectly adds the definition into a namespace it doesn't belong to

[sean-mcmanus]

test.cpp

namespace ns {

}

test.h

class foo {
public:
    foo();
};

1. Do Create Declaration / Definition on the foo() constructor in test.h.

Bug: It adds the foo() definition to the namespace block that it doesn't belong to (IntelliSense squiggles). The bug doesn't repro in VS -- the definition is correctly placed after the namespace block.

[michelleangela]

If there are at least 2 lines after the last function or namespace scope, then it doesn't repro.

So this is the same issue as #10500