Implemented correct copying, which actually copies python objects. Hopefully this works.

src/model/editable.py

@@ -1,4 +1,41 @@
-empty_doc = __new__(DOMParser()).parseFromString("<empty />", "text/xml")
+empty_doc = __new__(DOMParser()).parseFromString("<empty />", "text/xml").firstChild
+
+
+def copy(parent):
+    if type(parent) is None:
+        console.log("Copying non-transcrypt object, I think, this could go fairly wrong")
+        return parent
+    
+    elif type(parent) is dict:
+        result = {}
+        for k, v in parent.items():
+            result[k] = copy(v)
+        return result
+    
+    elif type(parent) is list:
+        return [copy(i) for i in parent]
+    
+    elif type(parent) is int or type(parent) is float or type(parent) is str or parent is None:
+        return parent
+    
+    else:
+        # some fancy object it looks like
+        result = __pragma__ ('js', "{{}};")
+        console.log(parent)
+        
+        proto = Object.getPrototypeOf(parent)
+        Object.setPrototypeOf(result, proto)
+        
+        result["__class__"] = parent.__class__
+        
+        for key in Object.getOwnPropertyNames(parent):
+            if key == "__class__":
+                continue
+            
+            val = getattr(parent, key)
+            result[key] = copy(val)
+         
+        return result
 
 
 class Editable:
@@ -9,8 +46,9 @@ class Editable:
             if self._copy is not None:
                 self._copy = None
         
-        # make new copy
+        # make new data only copy
-        self._copy = JSON.parse(JSON.stringify(self))
+        self._copy = copy(self)
+        
     
     def copy(self):
         # return internal copy of self
@@ -22,7 +60,8 @@ class Editable:
     
     def overwrite_with_copy(self):
         for key, value in dict(self._copy).items():
-            if key == "_copy":
+            # skip functions and _copy
+            if key == "_copy" or type(value) is None:
                 continue
             setattr(self, key, value)