Review Request: [engine explorer] Expand all / Collapse all buttons

[Gilles Chauvin]

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http://mattr.info:8080/r/354/
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Review request for Plasma.


Summary
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This patch adds 2 buttons -> "Expand all" and "Collapse all"


Diffs
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  /trunk/KDE/kdebase/workspace/plasma/tools/engineexplorer/engineexplorer.cpp

Diff: http://mattr.info:8080/r/354/diff


Testing
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Thanks,

Gilles