Created attachment 45130 [details]
filter with opacity
SVG filter gets clipped on use of opacity < 1. See: http://trac.webkit.org/browser/trunk/WebCore/rendering/SVGRenderSupport.cpp#L93
We could either delete the clipping, or try to get the filter rect. And we need to take the union of filter rect and objectboundingbox.
I have to take a look, if it is possible to get the filter rect some how.
Sorry, didn't noticed that this is a duplicate of another bug.
*** This bug has been marked as a duplicate of bug 32584 ***