Steps to reproduce:
- create a new C++ project
- add a main C++ file
- declare a class containing a method with a long name, e.g.:
class A{
  public:
    void jhkhkjhjhkhkhjghghgjhkhkhkhjhjhkhkhkhkhkkkhkhkhjhjhjhhkjhhhkhkhkhkhk();
};
- in the main(int argc, char** argv) method type following code:
A a;
a->

Result: CodeCompletion window appears with a horizontal scrollbar to show all
the method name. Because of that a return type field becomes invisible at first
sight.