[Inkscape-devel] preview in filter extension

hi list,

i am trying to program a python filter extension and i need to know if the script is called for preview or for the live run. i already found out that the script is called when the preview checkbox is checked and when the apply button is pressed, but i found no differences in the data delivered to the script when called.

in the c++ code both calls are different, but from the python side they seem to have the same effect.

are there any differences? or is there any other way to determine what was clicked?

thanks in advance, TimeWaster