A Button main's override on its icon instance's glyph (a red fill) was
lost when an instance swapped the icon: the outer rebuild re-copies the
glyph from the main's layer with no overrides of its own, so the nested
rebuild matched it by name and carried nothing. Before that rebuild, each
old layer of the swapped instance now takes the overrides held along the
source chain it had before this rebuild, through layers inside instances
in the mains that place the swapped instance. Geometry, slot content and
groups the layer overrides itself are left out. Matched by name, the
values carry onto the new main's layer as the instance's own: inherited
at the swap, frozen after, and back to the icon main's value on reset.
An icon main's own overrides stay with it.
Slots: a frame of a main component becomes a slot property
(component.makeSlot / removeSlot, preferred components, type "slot" in
component.properties). Instances show the main's default content until
the slot is edited; from then on its layers are the instance's own
(override group "slot"): free to add, remove and reorder, kept across
main updates, variant switches, copy/paste and detach, and instances
placed there stand alone. instance.slotInsert fills a slot,
instance.resetSlot brings the default content back. Structure
protection allows edits inside slots only; drops from the Assets panel,
canvas drags, drawing and paste land in slots. UI: slot icon in the
layers panel, dashed outlines and labels on the canvas, slot property
rows with a fill menu in the properties panel, Make/Remove slot on
frames inside a main.
Nested overrides: overrides inside a nested instance survive the main
moving it into another frame (layers matched by source alone when
unique); a nested instance copied out of an instance is re-linked to
its own main with its look kept (values set by component properties
aren't overrides); plain layers copied out of instances stop mirroring
them; canvas drags can no longer pull layers out of an instance or
reorder its auto layout children. Tests for swaps, variant switches,
main restructuring, detach and copy/paste.
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
MortenHusted
BFlatandClaude Opus 5.5