Review Request 114561: Information Panel: fix race condition (caused by multiple running PreviewJobs)

[Commit Hook]

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This review has been submitted with commit 8ed499f28fa2954c9b7c5fe0624d5b2b2b5c8630 by Frank Reininghaus to branch KDE/4.12.

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On Jan. 4, 2014, 9:33 a.m., Frank Reininghaus wrote:
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> https://git.reviewboard.kde.org/r/114561/
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> (Updated Jan. 4, 2014, 9:33 a.m.)
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> Review request for Dolphin.
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> Bugs: 250787
>     http://bugs.kde.org/show_bug.cgi?id=250787
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> Repository: kde-baseapps
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> Description
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> In
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> InformationPanelContent::showItem(const KFileItem& item) 
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> or
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> InformationPanelContent::showItems(const KFileItemList& items),
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> we either load an icon in the panel, or we start a PreviewJob to get a preview for the current item. However, if a long-running PreviewJob is active already, we load the preview that it creates later on, even though the preview might be for an item that is not hovered any more.
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> To fix this, we can keep a pointer to the last preview job, and kill it before a new item is being shown in the panel, or a new preview job is started.
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> Diffs
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>   dolphin/src/panels/information/informationpanelcontent.h ed9200a 
>   dolphin/src/panels/information/informationpanelcontent.cpp d63f23b 
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> Diff: https://git.reviewboard.kde.org/r/114561/diff/
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> Testing
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> I couldn't really test it yet because my development user does not have the PDF thumbnailer (yet), and previews for other files are generated so fast here that it's hard to see the race. But I verified that the panel still works as expected when hovering items.
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> Thanks,
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> Frank Reininghaus
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