Enum HwndOpenedOutcome 

enum HwndOpenedOutcome {
    Linked,
    Repaired(u64),
    NoMatchingLabel,
}

Internal — the four branches of apply_hwnd_opened against a known label_hint. Lifted into its own enum so the function can drop the &mut WindowMirror borrow before calling state.bump_version() on the drift-emitting path (rustc E0499).

Variants

Linked

Existing mirror was waiting for an HWND; linked successfully.

Repaired(u64)

Existing mirror was already linked to a DIFFERENT HWND. The explicit on_after_created path is authoritative — REPAIR by overwriting the stale link, and emit HwndWithoutBrowser drift to surface the prior incorrect link for diagnostics. Carry the prior HWND for the drift message. (PR #664: replaces the no-repair behavior that caused the panel grows but no window appears user symptom under burst creates.)

NoMatchingLabel

No mirror exists for that label — fall through to pending stash (caller responsibility).