A `.ai` file's PDF part is what apps that don't read VectorCraft's native
document open. It had no PDF layers: hidden layers and sublayers were left
out of it and everything else was flat page content.
- `.ai` files (Save As, exports, the CLI) write PDF layers unless
`createLayers` is false (a PDF standard still decides for itself).
- createLayers writes sublayers too, as optional content groups listed
under their layer's in `/Order`, hidden ones off with their art.
- A layer's form gets a box round the whole page instead of its art's
bounds, which readers made a clipping group of, gathering a layer's art
and its sublayers' in one group.
- PDF import: art inside a group, clip or form that dissolves into its
parent keeps the layer it was drawn in, so sublayers nested in their
layer's content import as sublayers.
- Save PDF: "Create PDF layers from layers and sublayers" (ja, es, it,
pt-br, ru, zh-hans, zh-hant).
Hidden objects (not layers) still aren't in the PDF part.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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