Review Request 126923: Make sure qapt-check doesn't get called repeatedly

[Mitch Golden]

Thanks for doing this - I have noticed my machine nearly falling over when 
the updater runs.  The updater itself pegs the CPU, and then spawns north 
of 100 apt-check processes.

Does this fix correct the high CPU in the updater itself?

   - Mitch Golden

On Thu, 28 Jan 2016, Aleix Pol Gonzalez wrote:

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> https://git.reviewboard.kde.org/r/126923/
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> Review request for Kubuntu.
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> Bugs: 347602 and 358359
>    https://bugs.kde.org/show_bug.cgi?id=347602
>    https://bugs.kde.org/show_bug.cgi?id=358359
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> Repository: discover
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> Description
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> Simplify the process that checks for system upgrades.
> - Makes sure it's only run when needed.
> - Doesn't recreate the QProcess instance.
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> Diffs
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>  libdiscover/backends/ApplicationBackend/ApplicationNotifier.cpp 25abc99
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> Diff: https://git.reviewboard.kde.org/r/126923/diff/
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> Testing
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> Not much, seems to work on my test Kubuntu system, waiting for feedback.
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> Thanks,
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> Aleix Pol Gonzalez
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