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Slightly more useful error on checkpoint stack corruption

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Kovid Goyal 2014-01-08 11:27:29 +05:30
parent 263c7c1469
commit ab7b6e1e99
1 changed files with 5 additions and 1 deletions
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4
src/calibre/gui2/tweak_book/undo.py
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@ -38,7 +38,11 @@ class GlobalUndoHistory(object):
self.pos = 0
def add_savepoint(self, new_container, message):
try:
self.states[self.pos].message = message
except IndexError:
raise IndexError('The checkpoint stack has an incorrect position pointer. This should never happen: self.pos = %r, len(self.states) = %r' % (
self.pos, len(self.states)))
extra = self.states[self.pos+1:]
cleanup(extra)
self.states = self.states[:self.pos+1]