Eric Holkandcameron a6620dc085 mermaid_render: Fix overlapping text in diagrams with long labels (#59140)
Mermaid diagrams with long node labels rendered as an unreadable jumble:
each label was painted as one long line over a box sized for wrapped
text, overflowing into neighboring nodes. With this change, labels wrap
to the box width the layout computed.

**Root cause:** mermaid's default `htmlLabels: true` makes merman emit
labels as HTML inside `<foreignObject>`, which resvg cannot rasterize.
merman's resvg-safe pipeline replaces each one with a single-line
`<text>` fallback that only honors explicit `<br>` breaks, so
soft-wrapped labels collapse onto one long line — while the node boxes
were laid out for the wrapped text.

**Fix:** disable HTML labels in the site config (both the top-level key,
which merman reads for node labels, and `flowchart.htmlLabels`, which it
reads for edge labels). merman then emits native SVG `<text>`/`<tspan>`
labels wrapped to the same measured width the layout used, and the
foreignObject fallback never runs for these diagrams.

One behavior preserved deliberately: a literal `\n` in label text used
to become a line break as a side effect of the foreignObject fallback
(`fallback.rs` converts `\n` when flattening HTML labels).
`render_mermaid` now normalizes `\n` to `<br/>` before rendering so the
native path keeps that behavior; the existing
`backslash_n_converted_to_line_break` test covers it.

Side effect: class diagram member text also switches from the lossy
fallback to native SVG text; the accent-class test was updated
accordingly (accent classes now land directly on `text`/`tspan`
elements).

Verified with `cargo nextest run -p mermaid_render`, `-p markdown`,
`script/clippy -p mermaid_render`, and `cargo fmt --check`.

Release Notes:

- Fixed mermaid diagram labels overflowing and overlapping nodes when
long labels wrap

---------

Co-authored-by: cameron <cameron.studdstreet@gmail.com>
2026-06-11 23:49:58 +00:00
2026-04-30 11:10:14 +00:00
2026-06-11 15:15:55 +00:00
2026-06-05 23:12:31 +00:00
2026-05-27 18:17:59 +00:00
2026-01-22 23:57:26 +05:30
2026-06-10 17:58:34 +00:00
WIP
2023-12-14 09:25:14 -07:00
2026-04-29 10:27:47 +00:00
2025-02-04 09:02:59 -05:00
2026-01-06 12:49:51 -08:00
2025-10-27 13:27:59 -04:00
2025-10-17 18:58:14 +00:00
2026-03-17 16:34:35 +00:00
2026-04-29 10:27:47 +00:00
2026-05-27 16:27:18 +00:00

Zed

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