fix duplicates completion of vhdl

src/completion/vhdl.rs

@@ -71,6 +71,7 @@ pub fn completion(server: &LSPServer, params: &CompletionParams) -> Option<Compl
                         .cloned()
                         .collect(),
                 );
+                comps.items.dedup_by_key(|i| i.label.clone());
                 Some(comps)
             }
             _ => None,
@@ -104,6 +105,7 @@ pub fn completion(server: &LSPServer, params: &CompletionParams) -> Option<Compl
                             .cloned()
                             .collect(),
                     );
+                    comps.items.dedup_by_key(|i| i.label.clone());
                     Some(comps)
                 }
             }