Review Request 125750: Reduce some allocations

[Aleix Pol Gonzalez]

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https://git.reviewboard.kde.org/r/125750/
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Review request for KDE Frameworks and Sebastian Kügler.


Repository: kcoreaddons


Description
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I know this could be done so much better and there's a comment saying it's transitional (heh), but this happens to be called a ton of times on every plasma boot through [1].
Actually, why is it transitional? Are we supposed to move from metadata.desktop to metadata.json? Or is it because we should all be using `kpackagetool5 --generate-index`?

[1] KPluginMetaData::loadFromDesktopFile(QString const&, QStringList const&)


Diffs
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  src/lib/plugin/desktopfileparser.cpp 7a4556a 

Diff: https://git.reviewboard.kde.org/r/125750/diff/


Testing
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Tests pass, plasma still boots.


Thanks,

Aleix Pol Gonzalez

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