for some reason, some controls doesnt update automatically when applied to imported images. But they update on other kinds of objects. See for example, feColorMatrix.
I think the image update problem is unrelated to the filter dialog. Changing a filter value in the XML editor also fails to update the filter when applied to an image.
Another issue I've noticed is that changing the values attribute for feColorMatrix in the XML dialog causes a segfault, although changing the value in the filter dialog works OK.
PS: colormatrix values should be stored for each of the possible types. It is not good to store all of them in a single variable. It would be much better if the user could adjust the value for one type, then change type and readjust value, and then change its mind again (maybe feeling that the previous type and value were better) and when he selects back the previous type he should see the respective old value still there.
Seems reasonable, I'll try it out.
-Nicholas