Ports PR #301 (by Kevin Griffin) to the SDF text renderer. Block-nested MTEXT
with inline colour codes (\C1;, \c…) collapsed to a single colour: the block
cache applies ByBlock / layer-0 colour inheritance per entity, so at emit time
every segment's colour was replaced with the inherited colour — including
segments carrying an explicit inline override.
- block_cache tessellate_sub_local: gate ByBlock / layer-0 colour inheritance
on `wire_on_base_color` (a wire whose colour differs from the entity base
carries an explicit override and keeps it) — #301's fix, still correct for
the remaining stroke wires.
- block_cache emit_wire: the per-vertex analogue for SDF text — a glyph whose
colour equals the wire's base inherits the resolved colour; a glyph with an
inline \C / \c override keeps it. (Previously every block glyph was recoloured
with final_color, collapsing colour-split MTEXT.)
- tests/text_font_rendering.rs: restore the block colour-split regression test
(it had stopped compiling on main when expand_insert gained the InheritStyle
param) and adapt it — and drawable_point_count — to SDF text_verts, since
block MTEXT now renders as glyph quads, not colour-split stroke wires.
\C (ACI) / \c (true-colour) are parsed by acadrust (mtext_format
SpanProperties.color) → OCS InlineColor → the glyph's per-vertex colour.
Co-Authored-By: Kevin Griffin <117586586+KevinGriffin-new@users.noreply.github.com>
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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