Backporting a blur-filter transparency bugfix to 2.2

[Dmitry Kazakov]

Hi, Cyrille and list!

Could you review r1123252 [0] and backport it to 2.2?
It fixes a bug Edward has described recently, when a blur filter makes
borders of the image transparent.

[0] - http://websvn.kde.org/?view=revision&revision=1123252

-- 
Dmitry Kazakov
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