UTILS: dkmap: make sure primary and secondary keys are never updated

lektor_utils/src/dkmap.rs

@@ -59,9 +59,13 @@ where
 
     /// Note that neither K1 nor K2 will be updated for an already existing mapping, ever
     pub fn insert(&mut self, value: (K1, K2, Values)) -> Option<(K1, K2, Values)> {
-        let (k1, k2, ..) = (value.0, value.1.clone());
+        let (k1, k2) = (value.0, value.1.clone());
         match self.primary_key_mapping.get(&k1) {
-            Some(index) => Some(mem::replace(&mut self.values[*index], value)),
+            Some(index) => Some((
+                k1,
+                self.values[*index].1.clone(),
+                mem::replace(&mut self.values[*index].2, value.2),
+            )),
             None => {
                 self.values.push(value);
                 let index = self.values.len() - 1;