- A copy Alt-dragged off a layer snaps to that layer too: its edges,
centres and equal spacing (Targets::add_box with the originals' box).
Before, the originals were left out of the snap targets, so a copy
couldn't line up with or space evenly from the layer it came from.
- Duplicate (Cmd+D) repeats the last duplicate's page offset while its
copies are what it duplicates: Alt-drag a copy, or Duplicate and move
the copy, then each Cmd+D steps out the next one as far again. The
step is measured when Duplicate runs. It lasts as long as the
selection (undo reuses ids), copies placed by an auto layout set no
step, and explicit dx/dy win.
- measure_tests: an Alt-dragged copy between its original and another
layer now snaps to equal spacing (45/45 instead of 50/40).
Tests: duplicate_spacing_tests (snap to the original, equal spacing,
repeat after moving a copy and after an Alt-drag, only for the last
copies, undo then a new layer, rotated frame, auto layout).
Refs #256
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
