what would be the alternative? to "kill" the python script on click?

maybe the button should just be removed, the only effect of this button
seems to be that it reverts the changes.

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https://bugs.launchpad.net/bugs/591435

Title:
  Cancel button does not halt extensions

Status in Inkscape: A Vector Drawing Tool:
  Triaged
Status in “inkscape” package in Ubuntu:
  Triaged

Bug description:
  The "Cancel" button does not properly halt execution of Inkscape
  extensions.

  This is not normally noticeable because extensions execute quickly.
  But for extensions that take a while-- i.e., those that you'd want to
  cancel --it turns out not to work.  It appears to wait (possibly a
  very long time) for the extension to finish executing before stopping
  the operation.

  To replicate, select Extensions>Render>L-system.   Set Order to 4.
  Click Apply, try to cancel the operation.   If your computer is fast
  and that didn't take very long, set Order to 5, 6, or 7 to make the
  extension take longer to run.

  Discovered on Mac OS 10.4/ Inkscape 0.47
  Verified on Windows XP/ Inkscape 0.47
  Verified on Mac OS 10.6/ Inkscape pre-0.48 snapshot from last week

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