Review Request: Lockout widget: Explain to the user that he must select a button to show

[Nicolas Lécureuil]

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http://svn.reviewboard.kde.org/r/6041/
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Review request for Plasma.


Summary
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When the user ask to show no buttons in the lockout widget, nothing tell the user that this is not possible, and when he saves the configuration nothing changed in the widget.

With this patch, if the user unselect all the checkboxes, he is warned.


This addresses bug 256879.
    https://bugs.kde.org/show_bug.cgi?id=256879


Diffs
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  trunk/KDE/kdebase/workspace/plasma/generic/applets/lock_logout/lockout.h 1202613 
  trunk/KDE/kdebase/workspace/plasma/generic/applets/lock_logout/lockout.cpp 1202613 

Diff: http://svn.reviewboard.kde.org/r/6041/diff


Testing
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Thanks,

Nicolas

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