'Edit Book' corrupts epub when find & replace fails

[MsBarrows]

Updated to 1.22 yesterday, today while editing some epubs to fix formatting problems/typos I've twice had it fail and error out, resulting in corruption to the epub file. As far as I can tell, it happens when I run a find and replace on something it is unable to find. For example, the second time it happened I was running a find for " </p>" (without quotes) and replacing with "</p>", in order to eliminate unnecessary spaces inserted prior to paragraph breaks. As often occurs, it took multiple passes to remove them all, so the results were something like replaced 258, 36, 1 and then on the next pass instead of reporting 0 it errored out.

The error message from that is:

calibre, version 1.22.0
ERROR: Unhandled exception: <b>TypeError</b>:QAbstractItemModel.dataChanged[QModelIndex, QModelIndex] signal has 2 argument(s) but 1 provided

calibre 1.22 [64bit] isfrozen: True is64bit: True
Windows-7-6.1.7601-SP1 Windows ('64bit', 'WindowsPE')
('Windows', '7', '6.1.7601')
Python 2.7.5
Windows: ('7', '6.1.7601', 'SP1', 'Multiprocessor Free')
Traceback (most recent call last):
  File "site-packages\calibre\gui2\tweak_book\boss.py", line 773, in search
  File "site-packages\calibre\gui2\tweak_book\boss.py", line 493, in rewind_savepoint
  File "site-packages\calibre\gui2\tweak_book\undo.py", line 119, in rewind_savepoint
TypeError: QAbstractItemModel.dataChanged[QModelIndex, QModelIndex] signal has 2 argument(s) but 1 provided

Attempts to do any further finds generates further errors. If I save the epub after the error, the epub file ends up being corrupted. Attempting to open it again gets the following error:

calibre, version 1.22.0
ERROR: Could not open ebook: D:\Calibre Library\snack_size\Revelations (648)\Revelations - snack_size.epub is not a valid EPUB file (could not find opf)

Traceback (most recent call last):
  File "site-packages\calibre\gui2\viewer\main.py", line 40, in run
  File "threading.py", line 761, in run
  File "site-packages\calibre\ebooks\oeb\iterator\book.py", line 99, in __enter__
  File "site-packages\calibre\customize\conversion.py", line 241, in __call__
  File "site-packages\calibre\ebooks\conversion\plugins\epub_input.py", line 200, in convert
ValueError: D:\Calibre Library\snack_size\Revelations (648)\Revelations - snack_size.epub is not a valid EPUB file (could not find opf)

[Kovid Goyal (kovid)]

Fixed in branch master. The fix will be in the next release. calibre is usually released every Friday.

 status fixreleased