Top-level groups already opened as layers named from data-name, else their
id. Now that also holds when one more id-less group wraps them (a transform
on all the art, or a <switch>'s chosen group), and hidden objects inside a
<switch> are kept (hidden) instead of dropped.
Nested groups stay groups unless something marks them as layers: the SVG
export now writes data-vc-layer="sublayer" on layers inside layers, and
import makes such a group (or an Inkscape layer group) a sublayer of the
layer holding it, in that layer's colour. A marked group anywhere else
stays a group.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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