more interactive edit

src/gui_qt/lib/undos.py

@@ -87,6 +87,21 @@ class ShiftCommand(QtWidgets.QUndoCommand):
         self.__data.apply('ls', self.__args)
 
 
+class EditCommand(QtWidgets.QUndoCommand):
+    def __init__(self, data, *args):
+        super().__init__('Edit signal')
+
+        self.__data = data
+        self.__arguments = args
+        self.__original = copy.deepcopy(self.__data.data)
+
+    def undo(self):
+        self.__data.data = copy.deepcopy(self.__original)
+
+    def redo(self):
+        self.__data.edit_signal(*self.__arguments)
+
+
 class NormCommand(QtWidgets.QUndoCommand):
     def __init__(self, data, mode):
         super().__init__('Normalize')