nu-cli/completions: fix file completions filtering (#5122)

crates/nu-cli/src/completions/file_completions.rs

@@ -97,6 +97,11 @@ impl Completer for FileCompletion {
 
         non_hidden
     }
+
+    // Replace base filter with no filter once all the results are already based in the current path
+    fn filter(&self, _: Vec<u8>, items: Vec<Suggestion>, _: CompletionOptions) -> Vec<Suggestion> {
+        items
+    }
 }
 
 pub fn file_path_completion(

crates/nu-json/src/de.rs

@@ -70,7 +70,7 @@ where
         }
     }
 
-    fn is_punctuator_char(&mut self, ch: u8) -> bool {
+    fn is_punctuator_char(&self, ch: u8) -> bool {
         matches!(ch, b'{' | b'}' | b'[' | b']' | b',' | b':')
     }