Move self in Element::paint

Remove mutable state borrows in favor of state ownership in render processes to streamline element rendering.

crates/gpui2_macros/src/gpui2_macros.rs

@@ -1,5 +1,6 @@
 mod action;
 mod derive_component;
+mod derive_element;
 mod register_action;
 mod style_helpers;
 mod test;
@@ -26,6 +27,11 @@ pub fn derive_component(input: TokenStream) -> TokenStream {
     derive_component::derive_component(input)
 }
 
+// #[proc_macro_derive(Element)]
+// pub fn derive_element(input: TokenStream) -> TokenStream {
+//     derive_element::derive_element(input)
+// }
+
 #[proc_macro_attribute]
 pub fn test(args: TokenStream, function: TokenStream) -> TokenStream {
     test::test(args, function)