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** Branch linked: lp:openlp/2.0

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https://bugs.launchpad.net/bugs/1310523

Title:
  Can't display songs that have more than 26 verses named equally

Status in OpenLP - Worship Presentation Software:
  Fix Committed
Status in OpenLP 2.0 series:
  In Progress
Status in OpenLP trunk series:
  Fix Committed

Bug description:
  Reported here: http://support.openlp.org/scp/tickets.php?id=2313

  The problem is that if we have multiple verses with the same name a letter will be appended to them according to the OpenLyrics specification (eg. v1,v1,v1 becomes v1a,v1b,v1c.
  Now if there are more than 26 verses with the same name, it runs out of characters and takes some weird ones. Then lxml fails to read them.

  You get this exception:

  Traceback (most recent call last):
  File "D:\OpenLP_Code\2.0\build\pyi.win32\OpenLP\out00-PYZ.pyz\openlp.core.lib.mediamanageritem", line 475, in onDoubleClicked
  File "D:\OpenLP_Code\2.0\build\pyi.win32\OpenLP\out00-PYZ.pyz\openlp.core.lib.mediamanageritem", line 497, in onPreviewClick
  File "D:\OpenLP_Code\2.0\build\pyi.win32\OpenLP\out00-PYZ.pyz\openlp.core.lib.mediamanageritem", line 591, in buildServiceItem
  File "D:\OpenLP_Code\2.0\build\pyi.win32\OpenLP\out00-PYZ.pyz\openlp.plugins.songs.lib.mediaitem", line 529, in generateSlideData
  File "D:\OpenLP_Code\2.0\build\pyi.win32\OpenLP\out00-PYZ.pyz\openlp.plugins.songs.lib.xml", line 365, in song_to_xml
  File "lxml.etree.pyx", line 2145, in lxml.etree._Attrib.__setitem__ (src/lxml/lxml.etree.c:46818)
  File "apihelpers.pxi", line 563, in lxml.etree._setAttributeValue (src/lxml/lxml.etree.c:15781)
  File "apihelpers.pxi", line 1366, in lxml.etree._utf8 (src/lxml/lxml.etree.c:22211)
  ValueError: All strings must be XML compatible: Unicode or ASCII, no NULL bytes or control characters

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