Review Request 114266: Update the "roles" for items that become visible again after filtering

[Commit Hook]

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This review has been submitted with commit 2260d70e21ad8ff49dc62bc096c7e5bbce9f0efe by Frank Reininghaus to branch KDE/4.12.

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On Dec. 2, 2013, 10:49 p.m., Frank Reininghaus wrote:
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> This is an automatically generated e-mail. To reply, visit:
> http://git.reviewboard.kde.org/r/114266/
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> (Updated Dec. 2, 2013, 10:49 p.m.)
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> 
> Review request for Dolphin.
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> Repository: kde-baseapps
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> Description
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> Since Dolphin 4.11, we store not only KFileItems, but also the corresponding ItemData struct for filtered items. This is required for keeping track of the parent-child relationships, and has the nice side effect that the ItemData need not be re-determined when the items are shown again.
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> However, this can become a problem if the visible roles or the sort role change while some items are filtered:
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> Problem A:
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> 1. Open a folder in Details View.
> 2. Press Ctrl+I, add a filter that removes some items.
> 3. Enable the "Permissions" column.
> 4. Clear the filter.
> 5. Note that the previously filtered items have an empty "Permissions" field.
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> Problem B (more difficult to reproduce in the GUI, but easily unit-testable):
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> 1. Open a large folder in Details View.
> 2. Enable the "Permissions" column ("User" and "Group" will also do, but it is important that there are files for which these fields differ).
> 3. Hide some items with the filter bar.
> 4. Switch to "Sort by Permissions/User/Group".
> 5. Clear the filter.
> 6. Note the incorrect sort order.
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> I think that there are no bug reports for these problems yet.
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> Problem A is fixed simply by clearing the QHash "values" for the filtered items if the visible roles change. The hash will be re-populated with all requested data as soon as the items are shown again and the data(int) method of the model is called.
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> Problem B requires a bit more work - before the items are inserted into the model after filtering, we have to make sure that the sort role "Permissions"/"User"/etc. is present in the hash "values". I think the easiest way to ensure that is to factor out the code that currently does this job for new items in createItemDataList() into a new function, and calling this in insertItems(), because the same treatment is required for the previously filtered files.
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> Diffs
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>   dolphin/src/kitemviews/kfileitemmodel.h c57329f 
>   dolphin/src/kitemviews/kfileitemmodel.cpp 4c85775 
>   dolphin/src/tests/kfileitemmodeltest.cpp 62ff4fa 
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> Diff: http://git.reviewboard.kde.org/r/114266/diff/
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> Testing
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> Fixes the problems for me. Old and new tests pass (and the new tests fail with current KDE/4.12 and master). I have not found any regressions yet.
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> Thanks,
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> Frank Reininghaus
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>

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