Review Request 118022: Replace hacky access to the declarative engine by a PmcRuntime class

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This review has been submitted with commit 4e4797f4a15973fc9b65416165b610462c361a3d by Shantanu Tushar to branch master.

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On May 6, 2014, 3:56 p.m., Shantanu Tushar wrote:
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> This is an automatically generated e-mail. To reply, visit:
> https://git.reviewboard.kde.org/r/118022/
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> (Updated May 6, 2014, 3:56 p.m.)
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> 
> Review request for Plasma.
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> Repository: plasma-mediacenter
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> Description
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> When backends needed to access some PMC objects like the playlist model or register image providers, they used to fetch a reference to the view's declarative engine. This is risky because it exposes the view to the backends which can then do anything with it.
> This patch adds a PmcRuntime class which serves as an official interface to these accesses cleanly.
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> Diffs
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>   browsingbackends/localfiles/localfilesabstractbackend.h 2d47eba 
>   browsingbackends/localfiles/localfilesabstractbackend.cpp b86a28a 
>   browsingbackends/localfiles/localpictures/localpicturesbackend.cpp f025c04 
>   browsingbackends/localfiles/localpictures/localpicturesmodel.h b1a81b4 
>   browsingbackends/localfiles/localpictures/localpicturesmodel.cpp c6b1816 
>   browsingbackends/localfiles/localvideos/localvideosbackend.cpp 8c20f27 
>   browsingbackends/localfiles/localvideos/localvideosmodel.h e836c14 
>   browsingbackends/localfiles/localvideos/localvideosmodel.cpp ab24013 
>   browsingbackends/metadatabackends/metadatamusicbackend/metadatamusicbackend.h 50af6c2 
>   browsingbackends/metadatabackends/metadatamusicbackend/metadatamusicbackend.cpp 6991c97 
>   libs/mediacenter/CMakeLists.txt f07d3ec 
>   libs/mediacenter/abstractbrowsingbackend.h 537d00d 
>   libs/mediacenter/abstractbrowsingbackend.cpp eea4ee5 
>   libs/mediacenter/backendsmodel.h f98f60a 
>   libs/mediacenter/backendsmodel.cpp 3a5fc30 
>   libs/mediacenter/pmcruntime.h PRE-CREATION 
>   libs/mediacenter/pmcruntime.cpp PRE-CREATION 
>   shells/newshell/mainwindow.h 0aaa513 
>   shells/newshell/mainwindow.cpp e369055 
>   shells/newshell/package/contents/ui/mediacenter.qml a62becc 
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> Diff: https://git.reviewboard.kde.org/r/118022/diff/
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> Testing
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> Adding songs to playlist, local pictures previews, local videos previews etc work fine.
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> Thanks,
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> Shantanu Tushar
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