Review Request: Fix bug197654: do not save config again when Apply button disabled

[Max Lin]

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http://git.reviewboard.kde.org/r/101159/
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Review request for Plasma.


Summary
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Ignore save config again after click Ok button when Apply button disabled. On Desktop Settings dialog with Slideshow mode, the image would not change again when we click Ok button after we clicked Apply button. 


This addresses bug 197654.
    http://bugs.kde.org/show_bug.cgi?id=197654


Diffs
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  libs/plasmagenericshell/backgrounddialog.cpp 53ac05a 

Diff: http://git.reviewboard.kde.org/r/101159/diff


Testing
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It's works fine on my machine.


Thanks,

Max

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