Implements signals

kordophone2/Models.swift

@@ -37,7 +37,7 @@ enum Display
         }
     }
     
-    struct Message: Identifiable
+    struct Message: Identifiable, Hashable
     {
         let id: String
         let sender: Sender
@@ -63,6 +63,14 @@ enum Display
             self.sender = sender
             self.text = text
         }
+
+        static func == (lhs: Message, rhs: Message) -> Bool {
+            lhs.id == rhs.id
+        }
+        
+        func hash(into hasher: inout Hasher) {
+            hasher.combine(id)
+        }
         
         enum Sender
         {