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

#, fuzzy

     7

msgid ""

     8

msgstr ""

     9

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

    10

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

    11

"POT-Creation-Date: 2012-09-08 01:21\n"

    12

"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"

    13

"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"

    14

"Language-Team: LANGUAGE <LL@li.org>\n"

    15

"Language: \n"

    16

"MIME-Version: 1.0\n"

    17

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

    18

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

    19

    20

# e0e40f1a04d7450688029783c597a70d

    21

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

    22

msgid "Beremiz installation"

    23

msgstr ""

    24

    25

# 5e953bd727894d009ca24f196368efbe

    26

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

    27

msgid "Windows"

    28

msgstr ""

    29

    30

# 03cff4ee7cf34d00b1fb7b38fa005659

    31

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

    32

msgid "Download installer, install."

    33

msgstr ""

    34

    35

# 6acb8dbf0a7e49e580a933ea249db0f3

    36

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

    37

msgid "Linux"

    38

msgstr ""

    39

    40

# bc03e803fcdb4657a592f44f07394253

    41

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

    42

msgid "Pre-requisites::"

    43

msgstr ""

    44

    45

# 288ed8f1d1f54cd289b063ed32f254ff

    46

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

    47

msgid "Prepare::"

    48

msgstr ""

    49

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# 526e508b99f243d089c784221be33306

    51

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

    52

msgid "Get Source Code::"

    53

msgstr ""

    54

    55

# 8387822a9b0d44f0acfda034356c2895

    56

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

    57

msgid "Build MatIEC compiler::"

    58

msgstr ""

    59

    60

# 6e641f0bd7294cebbf9945f9b6f30f49

    61

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

    62

msgid "Build CanFestival (optional)::"

    63

msgstr ""

    64

    65

# 893b801ddc7e4136b0b27c409addf250

    66

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

    67

msgid "Launch Beremiz::"

    68

msgstr ""