glib-macros: Derived boxed types are not TransparentPtrType but TransparentType

I.e. they're equal to their FFI representation, not equal to a pointer
of their FFI representation.

Fixes #1554

Author: sdroege

glib-macros/src/boxed_derive.rs

@@ -192,7 +192,9 @@ pub fn impl_boxed(input: &syn::DeriveInput) -> syn::Result<TokenStream> {
 
         #impl_from_value
 
-        unsafe impl #crate_ident::translate::TransparentPtrType for #name {}
+        unsafe impl #crate_ident::translate::TransparentType for #name {
+            type GlibType = #name;
+        }
 
         impl #crate_ident::translate::GlibPtrDefault for #name {
             type GlibType = *mut #name;

glib-macros/tests/test.rs

@@ -1,7 +1,7 @@
 // Take a look at the license at the top of the repository in the LICENSE file.
 
 use glib::{
-    collections::PtrSlice,
+    collections::Slice,
     prelude::*,
     translate::{FromGlib, IntoGlib},
 };
@@ -185,19 +185,16 @@ fn derive_boxed_nullable() {
 }
 
 #[test]
-fn boxed_transparent_ptr() {
+fn boxed_transparent() {
     #[derive(Clone, Debug, PartialEq, Eq, glib::Boxed)]
     #[boxed_type(name = "MyBoxed")]
     struct MyBoxed(String);
 
     let vec = vec![MyBoxed(String::from("abc")), MyBoxed(String::from("dfg"))];
 
-    // PtrSlice requires TransparentPtrType trait
-    let ptr_slice = PtrSlice::from(vec);
-    assert_eq!(
-        ptr_slice.last(),
-        Some(MyBoxed(String::from("dfg"))).as_ref()
-    );
+    // Slice requires TransparentType trait
+    let slice = Slice::from(vec);
+    assert_eq!(slice.last(), Some(MyBoxed(String::from("dfg"))).as_ref());
 }
 
 #[test]