Copy constraint properties when multiply and expand

assembly.py

@@ -1666,7 +1666,10 @@ class AsmConstraint(AsmGroup):
                                                   Assembly = assembly,
                                                   Constraint = None,
                                                   Elements = info)
-                    AsmConstraint.make(typeid,sel,undo=False)
+                    newCstr = AsmConstraint.make(typeid,sel,undo=False)
+                    Constraint.copy(cstr,newCstr)
+                    for element,target in zip(elements,newCstr.Group):
+                        target.Offset = element.Offset
                 cstr.Document.removeObject(cstr.Name)
                 FreeCAD.closeActiveTransaction()
                 return True

constraint.py

@@ -471,6 +471,10 @@ class Constraint(ProxyType):
     def canMultiply(mcs,obj):
         return getattr(obj,mcs.propMultiply(),None)
 
+    @classmethod
+    def copy(mcs,obj,target):
+        mcs.getProxy(obj).__class__.copyProperties(obj,target)
+
     @classmethod
     def setDisable(mcs,obj):
         return setattr(obj,mcs._disabled,True)

proxy.py

@@ -246,6 +246,13 @@ class ProxyType(type):
     def getPropertyInfoList(cls):
         return []
 
+    def copyProperties(cls,obj,target):
+        mcs = cls.__class__
+        for key in cls.getPropertyInfoList():
+            prop = mcs.getPropertyInfo(key)
+            if not prop.Internal:
+                setattr(target,prop.Name,prop.get(obj))
+
     def getName(cls):
         return cls.__name__