Source formatting is not preserved while using alternative (not like as Qt) code style.

For example we have some member in some .h file:

const std::string& TestFn(const std::string& str);

"Refactor" -> "Add definition in .cpp" will produce:

const std::string &Process::TestFn(const std::string &str)
{
}

I.e. ampersands are in wrong places - not the same as in header.
It should be like that:

const std::string& Process::TestFn(const std::string& str)
{
}

The same thing with asterisks.

I think place of ampersands and asterisks should be controlled via "Options" -> "C++" -> "Code Style", not hardcoded.