Add a battery of tests for text overrides in copies.
- A short notation for text content in tests (thtx): paragraphs of
runs with short style names, read back with equal runs joined,
edits in the notation, set-text and set-content through the change
path, and the override rule for texts (override-units), which says
which overrides a copy must hold against its main.
- Sync matrix: every whole-text copy edit against every main edit,
plus the cards of the worked examples, the "Hello world" table, a
token on a copy, typographies and a library color sync. Where the
code differs from decisions (k) to (o), the result is pinned
against F72 to F80.
- Switch matrix: copy edits against variants that differ in letters,
size, color, a new line or a bolded word; F76, F77, F79 and F81
pinned.
- Composable case BA: EditText also edits fills, font family and a
whole text; the copy and the main change different styles, then
reset or update main, in both runners; F72 pinned.
- Editor output: the content the WASM and v1 editors commit when a
copy text is typed into, retyped, split with Enter and has a word
bolded, recorded in the workspace and replayed on a copy. Typing
sets only the text groups and a style change no text override;
F79 pinned on both editors' content.
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