fix(vfs): V-01 — copy dispatches to CarrierFs in carrier mode

src/vfs.rs

@@ -952,11 +952,19 @@ impl DavFileSystem for SanctumFs {
     }
 
     fn copy<'a>(&'a self, from: &'a DavPath, to: &'a DavPath) -> FsFuture<'a, ()> {
+        if let Some(ref cfs) = self.carrier_fs {
+            return cfs.copy(from, to);
+        }
+
         Box::pin(async move {
             self.touch();
             let from_str = Self::path_to_str(from);
             let to_str = Self::path_to_str(to);
 
+            if from_str == to_str {
+                return Ok(());
+            }
+
             let node = self.resolve_path(&from_str)?.ok_or(FsError::NotFound)?;
 
             if node.is_dir {