[Bug 48548] broken gaussian blur

[Sevenissimo]

Public bug reported:

after final update gimp gaussian blur seems to be broken:
the blur on a trasparent layer returns a "to-black" fade, not expected :(

to reproduce: on new image:
- make a color spot on trasparent layer
- blur this with filters>gaussian blur
- put a (black/white or same-color) layer under this
- notice the "to-black" fade ...

** Affects: gimp (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

** Attachment added: "broken gaussian blur -> example"
   http://librarian.launchpad.net/3010686/broken_blur.xcf.bz2

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broken gaussian blur
https://launchpad.net/bugs/48548