This bug doesn't exist in 0.48.1

I saw it this morning in rev 10355 on Kubuntu

Couls someone confirm it before I fill it on Launchpad ?

When blur is combined with a Composite "in" some vertical dark lines are shown on rendering and exporting to bitmap.

If vertical blur is set to zero the lines change to dots.

If a little amount of black is added they disappear (here I decrease luminance and that works too).

ivan