FA-8993 / Text editing / Member archive

Composition-aware keyboard commands: Single-line Enter inserts a newline instead of submitting · case 03

Single-line Enter inserts a newline instead of submitting.

Member previewVariant 3 · 3 implementations · 12 checks per implementation

Case contract

Composition state or legacy code 229 delegates to native input; plain multiline Enter inserts newline; other Enter submits; Escape preserves draft; Tab honors Shift.

Why this case matters

A deterministic model of composition-aware keyboard commands; this isolates one interface invariant without requiring a browser.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
single	`["insert", "draft\n"]`	`["submit", "draft"]`	Failed

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