Review Request 128398: Fix KDescendantsProxyModel::setSourceModel(...) to reset internal data

[Sune Vuorela]

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I tried writing a small test for it, and it seemed like I could reproduce the issue. But my test didn't pass when I added this changeset.

Maybe I should publish my test case somewhere...

- Sune Vuorela


On July 8, 2016, 2:58 a.m., Friedrich W. H. Kossebau wrote:
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> This is an automatically generated e-mail. To reply, visit:
> https://git.reviewboard.kde.org/r/128398/
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> (Updated July 8, 2016, 2:58 a.m.)
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> Review request for KDE Frameworks, Stephen  Kelly and Stephen Kelly.
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> Repository: kitemmodels
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> Description
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> KDescendantsProxyModel currently does not reset its internal data when a (new) source model is set.
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> Not sure the provided patch is the most correct one, but it works with the current unit tests and for the use case where this bug was hit.
> I am still confused why `KDescendantsProxyModelPrivate::synchronousMappingRefresh()` loops over `while (!m_pendingParents.isEmpty())` on calling `processPendingParents();` while `KDescendantsProxyModelPrivate::scheduleProcessPendingParents()` does not.
> Especially when the `KDescendantsProxyModelPrivate::sourceModelReset()` handler also only calls the latter.
> The sourceModelReset handler should be surely similar to what is done on setting a new source model, so the patch for now copies that code. But from what I understood by reading the code both of them should rather do a full loop perhaps?
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> And `m_relayouting` should get a better name now, but no idea yet what would be nice.
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> I have yet to grasp the proxymodeltest system to also write a matching unit test, any proposal where I should start?
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> Diffs
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>   src/kdescendantsproxymodel.cpp 477cd96 
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> Diff: https://git.reviewboard.kde.org/r/128398/diff/
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> Testing
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> Existing kitemmodels unit tests still pass.
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> Thanks,
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> Friedrich W. H. Kossebau
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