Review Request: Drop InvisibleCollectionFetch Fetch Strategy in Favor of KDescendantsProxyModel

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This review has been submitted with commit eee07eee672374616c9a5bea25a9d61da9846f0b by David E. Narváez to branch KDE/4.7.

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On Nov. 19, 2011, 5:42 p.m., David Narváez wrote:
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> http://git.reviewboard.kde.org/r/103088/
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> (Updated Nov. 19, 2011, 5:42 p.m.)
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> Review request for Plasma and Christian Mollekopf.
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> Description
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> As the InvisibleCollectionFetch fetch strategy is currently broken, I implemented a suggestion by Christian Mollekopf of working around the issues by flatting the model through a KDescendantsProxyModel to fix crashes in Plasma related to calendars.
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> This addresses bug 279322.
>     http://bugs.kde.org/show_bug.cgi?id=279322
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> Diffs
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>   plasma/generic/dataengines/calendar/calendarengine.cpp 53f98c0 
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> Diff: http://git.reviewboard.kde.org/r/103088/diff/diff
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> Testing
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> 1. Add an iCal resource from the internet
> 2. Refresh the iCal resource
> 3. Refresh the iCal resource again if Plasma didn't crash on step 2
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> Withouth this patch, Plasma crashes when trying to remove an item that has no collection in the Calendar Model embedded in the Dataengine.
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> You should also be able to replicate bug 279322 without this patch and this patch should fix the situation described there.
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> Thanks,
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> David Narváez
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