Review Request: VCS: Speedup the check for non-existant git-repositories

[Fabian Wiesel]

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http://reviewboard.kde.org/r/532/
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Review request for KDevelop.


Summary
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In the case that a directory is not under the control of git, a check whether a directory is under version control accounts roughly 40ms of a total 70ms (Peak ~200ms) in the creation of a context menu.
By first checking for the existence of a .git directory in all parent directories, one avoids the call to an external program.  Should a correctly named directory be found, the external program is still called, which does a more sophisticated check.

In my limited "benchmark", the additional calling costs seem to be up to 1ms.


Diffs
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  /trunk/KDE/kdevplatform/plugins/git/gitplugin.cpp 950241 

Diff: http://reviewboard.kde.org/r/532/diff


Testing
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Thanks,

Fabian