Review Request 111617: Add a cache to speed-up the project filter

[Albert Vaca Cintora]

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Review request for KDevelop and Milian Wolff.


Description
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A performance improvement to my previous patch to the project filter [1] using a cache as suggested by Milian.

This patch also adds a very small change: It makes the project root folder always visible regardless of the filter.

[1] https://git.reviewboard.kde.org/r/111537/


Diffs
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  project/projectproxymodel.h c53d870 
  project/projectproxymodel.cpp c4d1a91 

Diff: http://git.reviewboard.kde.org/r/111617/diff/


Testing
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Manual testing


Thanks,

Albert Vaca Cintora

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