Efinic ConstraintManager improve delete method

litex/build/generic_platform.py

@@ -192,12 +192,17 @@ class ConstraintManager:
 
     def delete(self, signal):
         for res, obj in self.matched:
-            if isinstance(signal, Record):
-                if isinstance(obj, Signal):
-                    continue
-            else:
             if isinstance(obj, Record):
-                    continue
+                for pos, (name, item) in enumerate(vars(obj).items()):
+                        if isinstance(item, Signal):
+                                if item == signal:
+                                        # Two first pos are name and layout
+                                        del obj.layout[pos-2]
+                                        delattr(obj, name)
+                                        if len(obj.layout) == 0:
+                                            self.matched.remove((res, obj))
+                                        break
+            else:
                 if obj == signal:
                     self.matched.remove((res, obj))