[Bug 4048] New: Python Exception after file/directory rename when largefiles have been added

[mercurial-bugs at selenic.com]

http://bz.selenic.com/show_bug.cgi?id=4048

          Priority: normal
            Bug ID: 4048
                CC: mercurial-devel at selenic.com, natosha at gmail.com
          Assignee: bugzilla at selenic.com
           Summary: Python Exception after file/directory rename when
                    largefiles have been added
          Severity: bug
    Classification: Unclassified
                OS: Windows
          Reporter: dylan+bugz at q-games.com
          Hardware: PC
            Status: UNCONFIRMED
           Version: 2.7.1
         Component: largefiles
           Product: Mercurial

We encounter a crash with mercurial when largefiles (largefile extension) have
been added to a folder that has been moved (deleted) in a different branch,
then when you try to merge with that other branch you get this: 

#!python
    ** Mercurial version (2.7.1).  TortoiseHg version (2.9.1)
    ** Command: 
    ** CWD:  C:\Windows\system32 
    ** Encoding: cp932
    ** Extensions loaded: largefiles, zeroconf, fixtuf8
    ** Python version: 2.7.3 (default, Apr 10 2012, 23:24:47) [MSC v.1500 64
bit (AMD64)]
    ** Windows version: sys.getwindowsversion(major=6, minor=1, build=7601,
platform=2, service_pack='Service Pack 1')
    ** Processor architecture: x64
    ** Qt-4.8.4 PyQt-4.10.2 QScintilla-2.7.2
    Traceback (most recent call last):
      File "tortoisehg\hgqt\thread.pyo", line 283, in run
      File "tortoisehg\util\hglib.pyo", line 879, in dispatch
      File "mercurial\dispatch.pyo", line 778, in _dispatch
      File "mercurial\dispatch.pyo", line 549, in runcommand
      File "mercurial\extensions.pyo", line 188, in wrap
      File "hgext\zeroconf\__init__.pyo", line 175, in cleanupafterdispatch
      File "mercurial\dispatch.pyo", line 869, in _runcommand
      File "mercurial\dispatch.pyo", line 840, in checkargs
      File "mercurial\dispatch.pyo", line 775, in <lambda>
      File "mercurial\util.pyo", line 506, in check
      File "mercurial\commands.pyo", line 4292, in merge
      File "mercurial\extensions.pyo", line 188, in wrap
      File "hgext\largefiles\overrides.pyo", line 700, in hgmerge
      File "mercurial\hg.pyo", line 482, in merge
      File "mercurial\merge.pyo", line 743, in update
      File "mercurial\merge.pyo", line 566, in calculateupdates
      File "mercurial\extensions.pyo", line 188, in wrap
      File "hgext\largefiles\overrides.pyo", line 381, in overridemanifestmerge
      File "hgext\largefiles\lfutil.pyo", line 260, in splitstandin
      File "mercurial\windows.pyo", line 125, in pconvert
    AttributeError: 'NoneType' object has no attribute 'replace'


We had to export and import patches and then graft individual revisions to get
around this.

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