Version 1.0

Added

• UDIM support is added. Pact to options Active UDIM and Closest UDIM
  should work same as py.ops.uv.pack_islands().
• You can interrupt calculation via ESC key. Note that this does not cancel
  the operation. If a solution with better coverage is already found, UVs
  will be updated. (You can undo the operator)

Changed

• Moved from Unwrap menu to UV
  menu. b659c64
• When Max Iterations is set to 1 packer is run single threaded. Note
  that you need a lot more than one iteration to get decent results, this is
  intended for
  debugging. 8f36daf
• Previously any result with 20% coverage or better was considered successful
  and written to UVs. Now only the results with better coverage than input
  UVs are written. fc949cb

Fixed

• Fixed an issue where rotated islands were overlapping with other
  islands. 6ae83fe
• Earlier packing tended to produce results that cover a rectangular area
  (mostly x axis, y axis underutilized) instead of the whole UV square. This
  is fixed with
  e107900
  and
  3863a48.

Removed

• Removed baseline fitness calculation. This was not something users were
  seeing but before UDIM support, if all islands were not in UV unit square
  the operator gave an error. Otherwise a baseline fitness was being
  calculated and the UVs were only updated if the grid packer's result was
  better than the original UV map. When the UDIM support added calculating
  the baseline fitness became difficult so it was removed. Now the UVs are
  updated provided that all islands are placed on the grid (a solution is
  found). If the result is not good, you can undo.