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Fix #1908707 [Private bug](https://bugs.launchpad.net/calibre/+bug/1908707)
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@ -353,7 +353,7 @@ class History(collections.deque):
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class Document(QGraphicsScene):
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class Document(QGraphicsScene):
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num_of_pages = property(fget=lambda self: sum(self.chapter_layout))
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num_of_pages = property(fget=lambda self: sum(self.chapter_layout or ()))
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chapter_rendered = pyqtSignal(object)
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chapter_rendered = pyqtSignal(object)
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page_changed = pyqtSignal(object)
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page_changed = pyqtSignal(object)
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