schemeedit: Use all_nodes/links/annotations where appropriate

orangecanvas/document/schemeedit.py

@@ -1081,7 +1081,7 @@ def enumerateTitle(self, title):
         """
         if self.__scheme is None:
             return title
-        curr_titles = set([node.title for node in self.__scheme.nodes])
+        curr_titles = set([node.title for node in self.__scheme.all_nodes()])
         template = title + " ({0})"
 
         enumerated = (template.format(i) for i in itertools.count(1))
@@ -1096,8 +1096,8 @@ def nextPosition(self):
         Return the next default node position as a (x, y) tuple. This is
         a position left of the last added node.
         """
-        if self.__scheme is not None:
-            nodes = self.__scheme.nodes
+        if self.__root is not None:
+            nodes = self.__root.nodes()
         else:
             nodes = []
         if nodes:
@@ -2371,7 +2371,7 @@ def __paste(self, nodedups, linkdups, pos: Optional[QPointF] = None,
             return
 
         # find unique names for new nodes
-        allnames = {node.title for node in scheme.nodes + nodedups}
+        allnames = {node.title for node in scheme.all_nodes() + nodedups}
         for nodedup in nodedups:
             nodedup.title = uniquify(
                 nodedup.title, allnames, pattern="{item} ({_})", start=1)