Allow negative bleed margin in Printing Marks

Kuba Orlikrequested to merge
kuba-orlik/extensions:negative-bleed into master

What does the merge request do?

Enables the user to set negative bleed margins in the Printing Marks plugin

Implementation notes

Only changes in UI (.inx) code were necessary

Summary for release notes

It's useful to specify negative bleed when for example importing an image into inkscape that's prepared with some bleed margin in mind, but without printing marks. You can then specify negative bleed margin so it "cuts in" into the imported image, reflecting its intended bleed margin

Checklist

  • Add unit tests (if applicable): I'm not sure if unit tests are applicable here
  • Changes to inkex/ are well documented: no changes to inkex/
  • Clean merge request history

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