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mercurial/branchmap.py
changeset 28557 4b83507bfc91
parent 28556 0706d60d070f
child 28558 bcd106d456c4 
--- a/mercurial/branchmap.py	Sun Mar 13 02:06:21 2016 +0100
+++ b/mercurial/branchmap.py	Sun Mar 13 02:06:22 2016 +0100
@@ -482,6 +482,9 @@
                 if f.tell() != start:
                     repo.ui.debug("truncating %s to %s\n" % (_rbcrevs, start))
                     f.seek(start)
+                    if f.tell() != start:
+                        start = 0
+                        f.seek(start)
                     f.truncate()
                 end = revs * _rbcrecsize
                 f.write(self._rbcrevs[start:end])
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