Review Request: Do not bail out on rename if src==dest

[Kevin Funk]

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http://git.reviewboard.kde.org/r/107585/
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Review request for KDevelop and Andreas Pakulat.


Description
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Do not bail out on rename if src==dest

* In case source and destination are equal, just return RenameOk
  (this is the same behavior as std::rename has, when src==dest)
* Simplify both folder item's and file item's rename method by
  returning early in case the rename target is invalid
* Add new tests for folder, build folder and file items

BUG: 311151


Diffs
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  project/projectmodel.cpp 613ddb512d0f1909d5e74451146bf3138421a6a0 
  project/tests/projectmodeltest.cpp 4277b0c7e5b607fc9b50b9e0b24370ff0bdcd22f 

Diff: http://git.reviewboard.kde.org/r/107585/diff/


Testing
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Thanks,

Kevin Funk

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