fixup! USDShader : Add new node for loading shaders from `pxr::SdrReg…

…istry`

Set `name` plug before loading parameters, so that the nodule metadata can be computed as the GraphEditor starts querying it (which is immediately after each plug is added to the pasted node).

src/GafferUSD/USDShader.cpp

@@ -292,6 +292,9 @@ void USDShader::loadShader( const std::string &shaderName, bool keepExistingValu
 		throw Exception( fmt::format( "Shader \"{}\" not found in SdrRegistry", shaderName ) );
 	}
 
+	namePlug()->setValue( shaderName );
+	typePlug()->setValue( "surface" );
+
 	Plug *parametersPlug = this->parametersPlug()->source();
 
 	if( !keepExistingValues )
@@ -331,9 +334,6 @@ void USDShader::loadShader( const std::string &shaderName, bool keepExistingValu
 			outPlug->removeChild( child );
 		}
 	}
-
-	namePlug()->setValue( shaderName );
-	typePlug()->setValue( "surface" );
 }
 
 IECore::ConstCompoundObjectPtr USDShader::attributes( const Gaffer::Plug *output ) const