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Fix #522: SVG round trips keep hidden objects and data-* attributes

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An SVG used as an animation rig lost its hidden alternates and their
rotation pivots: the exporter left hidden objects out (only hidden layers
could be kept), and the importer dropped data-* attributes.

- SVG export: hiddenLayers (on by default for document.save, as before)
  now keeps hidden objects too, each written display="none" on its own
  element (path, image, text or group). Exports still leave them out
  unless asked; the CLI's convert asks, as a conversion keeps the
  document.
- An object's own data: ObjectAttributes.data, the data-* attributes in
  order (ours, data-name and data-vc-*, aside). The importer keeps them on
  the objects and layers they belong to (at most 64 per element), the
  exporter writes them back, the native format saves them (missing in
  older files), and object.setProps {data: {key: value|null}} sets or
  removes them.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
bflatastic
2026-10-09 03:36:08 +07:00
co-authored by Claude Opus 5.5
parent 207bd09635
commit 2a35c4a82f
12 changed files with 218 additions and 31 deletions
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docs/mcp.md
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@@ -266,9 +266,10 @@ place and paste). `run_command document.save {path: "x.svg", svg: {…}}` saves
Symbols export as one `<symbol>` with a `<use>` per instance. An instance the def can't stand for is written as its
own art: one stained by its fill; one scaled while the symbol has strokes (their weight doesn't scale), or rotated or
scaled while it has effects, brushes or live objects; and every instance of a symbol with pattern paints or unlinked
opacity masks (those stay on the page). `hiddenLayers: true` keeps hidden layers as groups that aren't displayed
(`display:none`); `document.save` keeps them unless told otherwise, exports leave them out, and they reopen as
hidden layers. A `preserveEditing` SVG carries the native document (CDATA in `<metadata>`) and a hash of the
opacity masks (those stay on the page). `hiddenLayers: true` keeps hidden layers and objects, not displayed
(`display="none"`); `document.save` and the CLI's `convert` keep them unless told otherwise, other exports leave
them out, and they reopen hidden. An object's own data (`object.setProps {data: {pivot: "100,180"}}`) is written as
`data-*` attributes (`data-pivot="100,180"`), and an SVG's `data-*` attributes come in as it. A `preserveEditing` SVG carries the native document (CDATA in `<metadata>`) and a hash of the
markup around it: if another app changed the SVG since, `document.open` reads it as plain SVG and says so in
`warnings`.