Dirty fix for error '_object_has_no_attribute_'getSlave' in EtherCAT extension

traceback:
File "/home/developer/WorkData/PLC/beremiz/beremiz/IDEFrame.py", line 1433, in OnPouSelectedChanged
window.RefreshView()
File "/home/developer/WorkData/PLC/beremiz/beremiz/etherlab/ConfigEditor.py", line 837, in RefreshView
self.RefreshProcessVariables()
File "/home/developer/WorkData/PLC/beremiz/beremiz/etherlab/ConfigEditor.py", line 886, in RefreshProcessVariables
slaves = self.Controler.GetSlaves(**self.CurrentNodesFilter)
File "/home/developer/WorkData/PLC/beremiz/beremiz/etherlab/EthercatMaster.py", line 341, in GetSlaves
for slave in self.Config.getConfig().getSlave():
<type 'exceptions.AttributeError'>:_'lxml.etree._Element'_object_has_no_attribute_'getSlave'

Steps to reproduce problem:

- Add new EtherCAT master
- Add new EthercatNode to the master
- double click on


this is looks like dirty hack to fix strange problem with initial[0]
changing its type after returning from _init_ method to lxml.etree._Element
As a result all methods generated by class factory are lost.

For example, in function initMethod initial[0].__class__ points to
xmlclass.xmlclass.Config. After map(self.append, initial)
self.Config.__class__ is 'xmlclass.xmlclass.Config' as well.
But after returning from initMethod (_init) in CreateElement
self.Config.__class__ has changed to lxml.etree._Element.


I've noticed similar behavior if copy/deepcopy is used for any child
of etree.ElementBase. See simple example below.
[-------------------------------------------------------------]
#!/usr/bin/python

from __future__ import print_function
from lxml import etree
import copy

class DefaultElementClass(etree.ElementBase):
def getLocalTag(self):
return etree.QName(self.tag).localname


def printInformation(x):
print(x, x.__class__, "getLocalTag" in dir(x))


a = DefaultElementClass()
printInformation(a)

#
printInformation(copy.copy(a))
printInformation(copy.deepcopy(a))
[-------------------------------------------------------------]

     1

# SOME DESCRIPTIVE TITLE.

     2

# Copyright (C) is 21st century inquisition

     3

# This file is distributed under the same license as the Beremiz package.

     4

# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.

     5

#

     6

msgid ""

     7

msgstr ""

     8

"Project-Id-Version: Beremiz 1.1\n"

     9

"Report-Msgid-Bugs-To: \n"

    10

"POT-Creation-Date: 2012-09-08 00:41\n"

    11

"PO-Revision-Date: 2012-09-07 10:53+0100\n"

    12

"Last-Translator: \n"

    13

"Language-Team: \n"

    14

"Language: \n"

    15

"MIME-Version: 1.0\n"

    16

"Content-Type: text/plain; charset=UTF-8\n"

    17

"Content-Transfer-Encoding: 8bit\n"

    18

"X-Poedit-Language: French\n"

    19

"X-Poedit-Country: FRANCE\n"

    20

"X-Poedit-SourceCharset: utf-8\n"

    21

    22

# c9c5ea5d04e64cb6a54fcda391cb4929

    23

#: ../../manual/install.rst:2

    24

msgid "Beremiz installation"

    25

msgstr "Installation de Beremiz"

    26

    27

# 3f78e50eff364a0abbfcb8cf9a0a68da

    28

#: ../../manual/install.rst:5

    29

msgid "Windows"

    30

msgstr "WIndows"

    31

    32

# 963db7a095b246d68c4a51163b441952

    33

#: ../../manual/install.rst:6

    34

msgid "Download installer, install."

    35

msgstr "Téléchergez l'installeur, exécutez le."

    36

    37

# 87380693201647979e3c0d0527205575

    38

#: ../../manual/install.rst:9

    39

msgid "Linux"

    40

msgstr "Linux"

    41

    42

# 0c4d6e88a20248b9bc3b167cf120c318

    43

#: ../../manual/install.rst:10

    44

msgid "Pre-requisites::"

    45

msgstr "Pre-requis::"

    46

    47

# ced14d340a194a2b9f53b8e6c34d6804

    48

#: ../../manual/install.rst:16

    49

msgid "Prepare::"

    50

msgstr "Préparation::"

    51

    52

# f555cb10ef0d42d6bbbe2f85f0763057

    53

#: ../../manual/install.rst:21

    54

msgid "Get Source Code::"

    55

msgstr "Obtenir le code source::"

    56

    57

# 1d5926626d3b49d891529b9fc687fec3

    58

#: ../../manual/install.rst:29

    59

msgid "Build MatIEC compiler::"

    60

msgstr "Compiler le compilateur MatIEC::"

    61

    62

# 166772d03f6f4d67abb4ed849fc3f6d8

    63

#: ../../manual/install.rst:35

    64

msgid "Build CanFestival (optional)::"

    65

msgstr "Compiler CanFestival::"

    66

    67

# 39a65c2b7ca747438a15d31bd4a40a4f

    68

#: ../../manual/install.rst:47

    69

msgid "Launch Beremiz::"

    70

msgstr "Lancer Beremiz::"