Each tab is wrapped in a Draggable (when allowReorder is true and the
entry itself is reorderable) and a DragTarget (always — the controller's
barrier logic decides whether the move actually happens). Drops insert
the dragged entry at the target tab's index. A 2px leading insertion
indicator highlights the active drop target.
The widget harness now wraps children in an Overlay so Draggable's
feedback can mount without each test re-wrapping. Sized by the test
view's bounds to avoid disturbing existing tests that query
find.byType(SizedBox).first.
Four widget tests cover the gesture path: drop reorders, pinned
barrier blocks, pinned tabs aren't draggable, and allowReorder=false
disables drag entirely.
Co-Authored-By: Claude <noreply@anthropic.com>
jpmschweitzerandClaude
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