Outline entries incorrect for specialized template classes containing namespace scopes

[Colengms]

Repro code:

namespace test_namespace
{
	class A
	{
	};
}

template <typename T2>
class B
{
};

template <>
class B<test_namespace::A>
{
};

Resulting outline:

It looks like a :'s from the namespace scope operator is being misinterpreted as a base-specifier colon.

(Maybe a possible fix would involve use of the lexer/BraceMatcher.)