FA-8239 / Direct manipulation / Member archive

Pointer-capture ownership: Uncaptured pointer movement drags the control · case 04

Uncaptured pointer movement drags the control.

Member previewVariant 4 · 3 implementations · 13 checks per implementation

Case contract

First pointer captures ownership; only its movement and release affect a drag; cancellation and capture loss clear ownership while preserving position.

Why this case matters

A deterministic model of pointer-capture ownership; 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
other move	`[1, 7]`	`[1, 4]`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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