Review Request: Reduce the memory usage of the fileWatcher plasmoid

[Simeon Bird]

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http://git.reviewboard.kde.org/r/105940/
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Review request for Plasma.


Description
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As noted in bug 256187, the fileWatcher plasmoid can use a lot of memory, particularly when first reading a file. 
This turns out to be because the whole file is added to the textDocument, instead of just the last few lines.

As a bonus, fix an (unreported) bug where if a line matched two filters, it could be printed twice.


This addresses bug 256187.
    http://bugs.kde.org/show_bug.cgi?id=256187


Diffs
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  applets/fileWatcher/fileWatcher.cpp fdf804c 

Diff: http://git.reviewboard.kde.org/r/105940/diff/


Testing
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Compiled, watched some (small and large) files, added and deleted lines from them. 


Thanks,

Simeon Bird

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