irisandClaude Fable 5.1 64f64b54e5 iris: per-block markdown appearance, syntax-highlighted fences, tappable links
P1a (docs/RUST.md). A transcript row's blocks are drawn the way
Markdown.kt draws them rather than as one flat span list:

- transcript-ui/src/markdown.rs is a *block* renderer now.
  `BlockFrame` is the whole widget vocabulary -- Plain, Verbatim (a
  dark rounded panel that pans sideways) and Quote (a bar and an
  indent) -- so a new markdown feature costs spans, not widgets.
  `frame_of` is the one place the BlockKind -> appearance mapping is
  written.
- Fences take `client_core::highlight`'s spans by language, in the
  same Catppuccin palette Theme.kt's `catppuccinSyntax()` uses, with
  the char->byte offset conversion the two index spaces need.
- Lists get the bullet ladder and coloured markers MarkdownPieces.kt
  draws, ordered lists count from the number they were written with,
  headings take Material's own ladder (24/22/16/14/12/11).
- Tables are padded monospace columns measured from the cells, with
  the header bold and a rule under it -- see docs/DECISIONS.md for
  what that trades against a real grid.
- Links carry their URL through to a tap. `GestureOutcome::Tapped`
  is new: a press that never committed to a pan or a selection, so a
  finger that flung the list past a link does not also open it.
  `iris::platform::OpenUrl` is the capability, implemented by each
  backend (xdg-open/open/start on the desktop, an ACTION_VIEW intent
  deferred to `after_input` on Android, the same shape
  `pending_show_keyboard` uses).
- `DragArbiter`/`DragGesture` take an axis, so a code fence pans
  across its own long lines through the same machine a list pans
  down its rows -- and a vertical drag starting on a fence still
  reaches the list.
- `TextEditCtx::byte_at` answers which byte a tap landed on without
  exposing the parley layout; `Rect::radius` takes a `Len`, so a
  corner can be written in dp.

Tests: 31 in transcript-ui (11 new, covering the frame mapping,
highlighting including a multibyte fence and an unknown language,
list markers, table padding and wrapping, link hit-testing), 85 in
iris (4 new on the tap-vs-drag rule and the two axes).
cargo fmt clean, clippy warning-free.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
2026-09-06 18:55:46 -04:00
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