Bug 245870 - Gaussian Blur filter preview is blocky, the edges of the image are blurred weirdly

I can confirm GB problems, but I find the strangest behavior with Blur filter.

When I make vector selection, and use Blur, it shows in preview quite OK, but then when I accept it, Blur area is rectangle, not my selection (OK, it's probably max extents of that vector selection).

Also Gaussian Blur doesn't respect selection or layer transparency lock.

These may seem minor but for some gradient coloring workflows they're major problems.

Good luck to devs! Hopefully these are not too hard problems.