Review Request 108868: fix KoTextWriter::saveParagraph(...) to not crash on QTextDocuments without a KoTextRangeManager

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This review has been submitted with commit cb552345280fa19e4d99707bfce9900ac4d04b65 by Friedrich W. H. Kossebau to branch master.

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On Feb. 8, 2013, 8:57 p.m., Friedrich W. H. Kossebau wrote:
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> (Updated Feb. 8, 2013, 8:57 p.m.)
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> Review request for Calligra and C. Boemann.
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> Description
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> I remember we talked about and decided to not add a check into the code but instead make sure in all places that a rangemanager is set on any QTextDocument. Seems we failed on this. And we may fail in the future, as there is nothing in the code which enforces this requirement.
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> So I now think it is better to have a slightly more complex code which checks if there is such a rangemanger, instead of blindly relying on that there is one. The only thing left for us is to refactor this code, to reduce the complexity. Or to introduce the use of a subclass of QTextDocument which makes sure there is always a rangemanager.
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> Patch changes code to do what is done for other optional properties of QTextDocument in other places, checks if the property exists and only then uses it.
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> Okay to backport to 2.6.0?
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> This addresses bug 314676.
>     http://bugs.kde.org/show_bug.cgi?id=314676
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> Diffs
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>   libs/kotext/opendocument/KoTextWriter_p.cpp 4ac1558 
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> Diff: http://git.reviewboard.kde.org/r/108868/diff/
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> Testing
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> Crash as reported in the bug does no longer happen for me.
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> Thanks,
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> Friedrich W. H. Kossebau
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