[Kde-pim] Review Request 109186: work around a file descriptor leak when using QFileSystemWatcher

[Wolfgang Rohdewald]

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http://git.reviewboard.kde.org/r/109186/
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Review request for KDEPIM.


Description
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this cleans up some code and avoids warnings from QFileSystemWatcher when many mails are moved between folders. QFileSystemWatcher leaks four file descriptors for every moved mail because removeDir does not close the fd (as can be seen in /proc/X/fd where X is the process id of akonadi_agent_launcher akonadi_maildir_resource). On my system (kubuntu 12.10) warnings start when 1024 file descriptors are open.

I did not yet investigate which notifying method QFileSystemWatcher actually uses.

This has 3 commits:

1. factor out common code
2. add a missing restore command in an error path
3. do not use removeDir/addDir but stopDirScan/restartDirScan


Diffs
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  resources/maildir/maildirresource.h f792b23f49cd493f128602649384d2a790ec3b47 
  resources/maildir/maildirresource.cpp 6485f99d8f81cc46913cc473978ace818cbd114d 

Diff: http://git.reviewboard.kde.org/r/109186/diff/


Testing
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moving mails between folders. Needed time is about the same as before (like 50 seconds for 900 mails)


Thanks,

Wolfgang Rohdewald

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