I was a silly goose didn't notice my `git push` failed, so merged #57967
without a critical commit, and some follow-ups.
This PR just cherry-picks those commits.
Release Notes:
- N/A or Added/Fixed/Improved ...
Following up on #57644 by @cameron1024, this PR updates `merman` to
v0.6.
With merman 0.6's new raster-safe SVG pipeline, Zed can move generic
`usvg`/`resvg` cleanup passes out of this crate and rely on merman for
them instead.
**What's moved to merman:**
- `foreignObject` fallback text generation
- Unsupported CSS cleanup
- Invalid SVG attribute cleanup
**What's kept in Zed:**
- Theme CSS injection and accent color assignment
- Zed-specific fallback overlay handling
**Integration note:**
In merman v0.6, fallback overlay groups are marked with
`data-merman-foreignobject="fallback"` and preserve source classes like
`node` or `section-*`, so host CSS can still style fallback text. This
PR updates Zed's accent tracker to check for this marker, ensuring
fallback overlays are not treated as real layout nodes.
I also added a render-stage test for the new contract: the SVG output
from `render_mermaid` is already raster-safe before Zed-specific
post-processing runs.
---
### Self-Review Checklist:
- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content is consistent with the [UI/UX
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
- [x] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable
### Release Notes:
- Improved rendering of Mermaid diagrams in Markdown previews.
### Tests:
- `cargo +1.95 fmt --check -p mermaid_render`
- `cargo +1.95 test -p mermaid_render`
- `cargo +1.95 clippy -p mermaid_render --all-targets -- -D warnings`
- `git diff --check HEAD~1..HEAD`
---------
Co-authored-by: cameron <cameron.studdstreet@gmail.com>
Closes FR-49
This PR fixes stack overflow in flowcharts with deeply nested subgraphs.
Rewrote recursive call to iterate with an explicit stack on heap. Added
test which reproduces the overflow.
We use our fork now, with patch on existing v0.4.0:
https://github.com/zed-industries/merman/commit/1c765dcca2ef5092fcde7bebe8374819563623ef
Release Notes:
- Fixed a crash in when rendering Mermaid diagram flowcharts with deeply
nested subgraphs.
Cameron Mcloughlin