Add clear undo

source/diff.py

@@ -272,10 +272,6 @@ class LOCalc(LODocument):
             self.cell_style[name] = obj
         return LOCellStyle(obj)
 
-    def clear_undo(self):
-        self.obj.getUndoManager().clear()
-        return
-
     def filter_by_color(self, cell=None):
         if cell is None:
             cell = self.selection.first

source/easymacro2.py

@@ -1067,6 +1067,10 @@ class LODocument(object):
         else:
             um.enterHiddenUndoContext()
 
+    def clear_undo(self):
+        self.obj.getUndoManager().clear()
+        return
+
     @property
     def selection(self):
         sel = self.obj.CurrentSelection