--disable-name-namespacing has no effect on vtable functions

Input C/C++ Header

class TestClass {
public:
	virtual void method() = 0;
};

Bindgen Invocation

$ bindgen input.h --vtable-generation --disable-name-namespacing header.h -- -x c++

Actual Results

#[repr(C)]
pub struct TestClass__bindgen_vtable {
    pub TestClass_method: unsafe extern "C" fn(this: *mut TestClass),
}
#[repr(C)]
#[derive(Debug, Copy, Clone)]
pub struct TestClass {
    pub vtable_: *const TestClass__bindgen_vtable,
}

Expected Results

The TestClass prefix for TestClass_method should be removed.

Reproduce the issue with the shown C++ header and bindgen invocation using --vtable-generation and --disable-name-namespacing. Trace the vtable-generation and name-namespacing handling, then verify that the generated vtable function no longer includes the TestClass prefix while the expected TestClass binding remains valid.