Review Request 111382: Make sure that KItemListSizeHintResolver is always in a consistent state

[Commit Hook]

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This review has been submitted with commit 36e28db3f3d90acbe2c2eb92f0569f5fe2f3b06e by Frank Reininghaus to branch master.

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On July 4, 2013, 12:21 p.m., Frank Reininghaus wrote:
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> (Updated July 4, 2013, 12:21 p.m.)
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> Review request for Dolphin.
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> Description
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> The other day, I found out what the real cause for bug 317827 is. The assert verifies that the layouter is "dirty", i.e., that no function that triggers a layouting has been called in the loop in KItemListView::slotItemsRemoved(const KItemRangeList&). This is done because the item ranges are removed step by step from KItemListSizeHintResolver, such that it is in an inconsistent state inside the loop, and any attempt to start a layout may yield incorrect results. However, if an animation is ongoing, calling "m_animation->stop(widget)" will trigger KItemListView::slotAnimationFinished(), which calls m_layouter->firstVisibleIndex(), which then triggers KItemListViewLayouter::doLayout().
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> I think the best way to fix this is to make sure that all item ranges are always inserted to and removed from KItemListSizeHintResolver at once. A nice side-effect is that there is one source less for O(N^2) behaviour if many item ranges are inserted/removed (but there are still more, which I will look at).
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> Moreover, this fixed some more inconsistencies in KItemListView::setModel(), which caused KItemListSizeHintResolver to have more items than actually needed .
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> This addresses bug 317827.
>     http://bugs.kde.org/show_bug.cgi?id=317827
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> Diffs
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>   dolphin/src/kitemviews/kitemlistview.cpp b5e1058 
>   dolphin/src/kitemviews/private/kitemlistsizehintresolver.h 6f50d67 
>   dolphin/src/kitemviews/private/kitemlistsizehintresolver.cpp e075b46 
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> Diff: http://git.reviewboard.kde.org/r/111382/diff/
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> Testing
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> Works. Note that the patch still contains some debug output that makes it easier to see if the items are moved and initialized correctly. I'll remove it before pushing the patch.
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> Thanks,
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> Frank Reininghaus
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