FA-36158 / Tab interfaces / Member archive

Drag cancel rollback: cancel pane owner · case 03

The tab workspace reports an incorrect cancel pane owner.

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

Canceling a tab drag restores source pane and rank, removes provisional destination placeholder, restores prior selection, releases capture and discards detach preview.

Why this case matters

Offline tab/panel workspace behavior; no browser or desktop framework is emulated.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
workspace regression 0	`[["a", "b", "c", "extra0", "extra1"], "q", 1, true, "a", "discard"]`	`[["a", "b", "c", "extra0", "extra1"], "p", 1, true, "a", "discard"]`	Failed

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

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