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[jazzynico <591435@xxxxxxxxxxxxxxxxxx>]

Yes, hiding the button could be a temporary workaround.

On the other hand, I wonder how hard it would be to just kill the
extension process from the main code.

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

Title:
  Cancel button does not halt extensions

Status in Inkscape:
  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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