Review Request: Add fade effect to wallpaper plugin.

[Matthew Dawson]

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http://reviewboard.kde.org/r/195/
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Review request for Plasma.


Summary
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This patch makes the wallpaper plugin fade out the old wallpaper when it changes.  Currently the effect only works when in slideshow mode.

Video Demo:
http://mjdsystems.ca/fadedemo.ogv


This addresses bug 168731.
    https://bugs.kde.org/show_bug.cgi?id=168731


Diffs
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  /trunk/KDE/kdebase/workspace/plasma/wallpapers/image/image.h 932504 
  /trunk/KDE/kdebase/workspace/plasma/wallpapers/image/image.cpp 932504 

Diff: http://reviewboard.kde.org/r/195/diff


Testing
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Locally in Xephyr.


Thanks,

Matthew