Review Request 129909: Fix reading comicbooks in zip format

[Eugene Shalygin]

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https://git.reviewboard.kde.org/r/129909/
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Review request for Okular and Albert Astals Cid.


Repository: okular


Description
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Okular refuses to load .cbr files because a `QIODevice` object returned by `KArchiveFile::createDevice()` is not seekable and because of that `QImageLoader` can't detect image format. Proposed solution: if that device is not seekable or `QIODevice::size()` returns 0, copy its content into a temporary file and load image from it.


Diffs
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  generators/comicbook/document.cpp 34c4cb5a 

Diff: https://git.reviewboard.kde.org/r/129909/diff/


Testing
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Well, it loads .cbr files now :)


Thanks,

Eugene Shalygin

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