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Fix two errors introduced in #1110 and #1112. Since #1110, encountering the invalid indirect reference #1110 -2147483648 n R produces an integer underflow which, if undetected, immediately trigger a logic error. Since #1112, object -1 0 R may be incorrectly identified as an earlier generation of itself and deleted, invalidating a live iterator.
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Change set visited to std::vector<bool>
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Swap front and back, and change queue from list to vector
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Test for missing object before accessing obj_copier.object_map.
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Ensure that links to foreign pages are not broken provided that the page is subsequently copied.
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… object (fixes #1011)
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Change JSONHandler::m to std::unique_ptr and declare Members in implementation file
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Apply various Clang-Tidy rules
