Show differences dialogue crashes

[Antti Pikkarainen]

When viewing the working tree, you can open "Show differences" dialogue.

The dialogue window opens but when file contents are being populated to scrollbar areas, I get often (about 50% of files) Error message. This happens often if there is only few changes or only altered carriage return / line feed characters.

Error content:
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bzr: ERROR: exceptions.IndexError: pop from empty list

Traceback (most recent call last):
  File "G:/Program Files/Bazaar/plugins\qbzr\lib\trace.py", line 300, in reports_exception_decorate
  File "G:/Program Files/Bazaar/plugins\qbzr\lib\diffwindow.py", line 235, in initial_load
  File "bzrlib\cleanup.pyo", line 131, in run
  File "bzrlib\cleanup.pyo", line 165, in _do_with_cleanups
  File "G:/Program Files/Bazaar/plugins\qbzr\lib\diffwindow.py", line 248, in _initial_load
  File "G:/Program Files/Bazaar/plugins\qbzr\lib\diffwindow.py", line 404, in load_diff
  File "G:/Program Files/Bazaar/plugins\qbzr\lib\diffview.py", line 435, in append_diff
  File "G:/Program Files/Bazaar/plugins\qbzr\lib\diffview.py", line 384, in insertIxsWithChangesHighlighted
IndexError: pop from empty list

bzr 2.2.3 on python 2.6.4 (win32)
arguments: ['G:\\Program Files\\Bazaar\\tbzrcommand.exe', '--command=explorer', '--file=H:\\htdocs\\api']
encoding: 'cp1252', fsenc: 'mbcs', lang: None
plugins:
  bzrtools G:\Program Files\Bazaar\plugins\bzrtools [2.2.0]
  colo G:\Program Files\Bazaar\plugins\colo [0.2.0]
  explorer G:\Program Files\Bazaar\plugins\explorer [1.1.2]
  fastimport G:\Program Files\Bazaar\plugins\fastimport [0.9.0dev]
  launchpad G:\Program Files\Bazaar\plugins\launchpad [2.2.3]
  loom G:\Program Files\Bazaar\plugins\loom [2.2.1dev]
  netrc_credential_store G:\Program Files\Bazaar\plugins\netrc_credential_store [2.2.3]
  news_merge G:\Program Files\Bazaar\plugins\news_merge [2.2.3]
  pipeline G:\Program Files\Bazaar\plugins\pipeline [1.1.0]
  qbzr G:\Program Files\Bazaar\plugins\qbzr [0.19.2]
  rewrite G:\Program Files\Bazaar\plugins\rewrite [0.6.1]
  svn G:\Program Files\Bazaar\plugins\svn [1.0.4]
  upload G:\Program Files\Bazaar\plugins\upload [1.0.0]
  xmloutput G:\Program Files\Bazaar\plugins\xmloutput [0.8.6]
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