An object is only updated with opacity, and not blending mode, when moved through a layer

Confirmed (not yet this test-case but in a real-world example) in Inkscape 0.46 on amd64 Gentoo Linux.

Btw, in one case, the trouble could be fixed by removing the "filter:url(#filterXXXX)" property from the style attribute manually.

I can confirm this and add what I think is a related issue.

Create layers 1,2,3 as above, although I tried this with multiply blend mode. Set layers 1 (top) and 3 (bottom) to normal blend mode, then set layer 2 to multiply blend mode, all at 100% opacity.

Create a colored rectangle in layer 3 and one in layer 1, different colors (I use blue and yellow). Select the blue rectangle in layer 1, and SHIFT+PAGEDOWN it twice to layer 3. I notice two issues already: First, it does not assume the multiply blend mode in layer 2, only when it enters layer three does that take effect. Secondly, the boundary box for the rectangle extends way beyond the rectangle (something like a margin is introduced).

Now the blue rectangle does not ever seem to lose the multiply blend effect, regardless of the layer to which you move it. Adjusting the blur on the blue rectangle restores its normal blend mode as well as bounding box.

Michael Nachtigal wrote:
> (…) and add what I think is a related issue.

That issue is handled in
Bug #233800 “Moving an object through a layer with blending options causes the object to adopt blending options”
<https://bugs.launchpad.net/inkscape/+bug/233800>

About the size of the selection bounding box: that's the default filter effects region the object(s) get when they adopt the layer blend mode after having been moved out of the blended layer. You can learn more about SVG filter effects (and the filter effects region) in the manual:
<http://tavmjong.free.fr/INKSCAPE/MANUAL/html/Filters-BasicUse.html>