Fix _unnamed_arg so that arguments defined by GDExtension show up in docs.

The Godot API (gdnative_interface.h) allows methods to be registered on
extension classes with

`classdb_register_extension_class_method`

a `GDNativeExtensionClassMethodInfo` can be provided to this function
along with a `get_argument_info_func` which according to the comment
indicates that argument names should be definable here.

Unfortunately, setting the name field in the `GDNativePropertyInfo`
struct has no effect on the editor documentation, which continues to
display "_unnamed_arg" for each argument.

I discovered that `get_argument_info` is responsible for this as it
always overrides the `info.name`. I've added an if condition that will
only override the name when it is empty. I've tested this with my
GDExtension module and I can confirm that with this commit, the argument
name shows up in the builtin docs. eg. in Lookup Symbol.

0 files changed, 0 insertions, 0 deletions