Layer Options › Print off means the layer's art does not print. The Layers panel now paints
that layer's name italic, as Illustrator shows non-printing layers, and the ghost of a row
being dragged keeps the italic. A printing layer's name stays upright, and ticking Print
again restores it.
Row names are painted rather than widgets, so the italics come from a layout job's text
format (egui slants the glyphs itself; no italic face is needed).
Tests: panels::layers::tests::a_layer_that_does_not_print_has_its_name_italic covers Print
off, Print on again, and a plain printing layer; the layers suite (64 tests) passes.
Docs: roadmap, target-app-parity and ui-parity carry the change.