Rename on using does not work correctly

[kirillbobyrev]

The following example is not handled correctly: when selecting at the first location (using a::TA;), the rename is not triggered due to "there are multiple symbols under the cursor" error, when selecting the second one, using a::TA does not change, presumably because we check that all Ref targets are within TargetIDs set.

namespace some_ns {
struct A {
  void foo();
};
} // namespace some_ns
namespace a {
typedef some_ns::A [[TA]];
}

using a::[[T^A]];
auto gA = &[[T^A]]::foo;

[hokein]

looks like #170 is a similar issue.