Review fixes for the inpaint crop and stitch helpers.
- The crop window now contains the full feathered edge, so the blend at
the seam is complete.
- Outpaint extension bands stay fully paintable after the mask is
shrunk or softened.
- The reported blend mask no longer extends past the area actually
pasted.
- The Crop for Inpaint, Stitch Inpaint and Realign to Source help pages
are corrected (Multiple default, Max zoom wording, resizing caveat).
Tests: tests/test_inpaint_crop_helpers.py covers the feather, the
bands and the partial paste window; tests/inpaint_help.test.mjs checks
the help pages against the code; the classic pin test keeps comparing
against the released output.
Crops and blend masks differ slightly from earlier releases for the
same inputs. No inputs, outputs or mapping keys change.