silently re-add diff::tree::ChangeDetached

It's nice to have a symmetric API and it fits into `gix`.

gix/src/object/tree/diff/change.rs

@@ -1,8 +1,8 @@
+use super::ChangeDetached;
 use crate::bstr::{BStr, ByteSlice};
 use crate::ext::ObjectIdExt;
 use crate::object::tree::diff::Change;
 use crate::Repository;
-use gix_diff::tree_with_rewrites::Change as ChangeDetached;
 
 impl Change<'_, '_, '_> {
     /// Produce a platform for performing a line-diff no matter whether the underlying [Change] is an addition, modification,

gix/src/object/tree/diff/mod.rs

@@ -12,6 +12,8 @@ pub enum Action {
     Cancel,
 }
 
+pub use gix_diff::tree_with_rewrites::Change as ChangeDetached;
+
 /// Represents any possible change in order to turn one tree into another.
 #[derive(Debug, Clone, Copy)]
 pub enum Change<'a, 'old, 'new> {