rename variable to keep consistency

src/View/DIFAdisTS/UndoCommand.py

@@ -162,13 +162,13 @@ class DelCommand(QUndoCommand):
         self._dif_spec = dif_spec
         self._rows = rows
 
-        self._ic = []
+        self._dif = []
         for row in rows:
-            self._ic.append((row, self._dif_spec[row]))
-        self._ic.sort()
+            self._dif.append((row, self._dif_spec[row]))
+        self._dif.sort()
 
     def undo(self):
-        for row, el in self._ic:
+        for row, el in self._dif:
             self._data.insert(row, el)
 
     def redo(self):