WIP: Update 'inactive_overload_cache' key

Instead of just the function name, use '__qualname__.name'.

include/pybind11/pybind11.h

@@ -2411,13 +2411,16 @@ inline function get_type_overload(const void *this_ptr, const detail::type_info
     if (!self)
         return function();
     handle type = self.get_type();
-    auto key = std::make_pair(type.ptr(), name);
+    /* N.B. This uses `__qualname__.name` instead of `name`
+       to resolve pybind11#1922. */
+    auto full_name = type.attr("__qualname__").cast<std::string>() + "." + name;
+    auto key = std::make_pair(type.ptr(), full_name.c_str());
 
     /* Cache functions that aren't overloaded in Python to avoid
        many costly Python dictionary lookups below */
     auto &cache = detail::get_internals().inactive_overload_cache;
-    if (cache.find(key) != cache.end())
-        return function();
+    //if (cache.find(key) != cache.end())
+    //    return function();
 
     function overload = getattr(self, name, function());
     if (overload.is_cpp_function()) {