The editor preview mis-sized imported MTEXT badly (tiny, huge, or
collapsed). Two root causes:
- The entity's base height often isn't the visible text height: relative
`\H…x;` codes compound, so an entity of height 1 whose body is `\H0.2x`
renders at 0.2. Normalize the preview scale by the DOMINANT rendered run
height (the mode of glyph-box heights, skipping zero-width caret slots),
not `height_value()`, so the body lands at a fixed readable size and
headings keep their proportions. EM_PX = 15.
- The bug that made it "completely wrong" was in the serializer, fixed in
acadrust 389b31a (\H heights decayed on the parse→serialize→parse the
editor does via folded_value); bumped here.
Also render multi-column MTEXT with its columns side by side (as the
drawing does) and let the preview scroll horizontally to reach them.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
4479ba8c29