Enum HwndDriftKind 

pub enum HwndDriftKind {
    BrowserWithoutHwnd,
    HwndWithoutBrowser,
    HiddenSinceOpen,
    OffMonitor,
    OrphanDestroy,
    LingeringHwnd,
    OrphanInstance,
}

Phase B.9.1 — six classes of CEF↔Win32 disagreement the reducer can detect at event-dispatch time. See the WRR design doc for the per-kind triggering Command and reducer action.

Variants

BrowserWithoutHwnd

state.windows has a label whose hwnd field never got populated, AND a follow-up event arrived that should have reconciled it. CEF says open, Win32 has no matching HWND.

HwndWithoutBrowser

HWND in the host’s report doesn’t map to any state.windows / state.pool label. Win32 has it, CEF didn’t open it. The “stray taskbar” case.

HiddenSinceOpen

HWND for a known label was never SHOWN (no foreground event) since open and a subsequent state transition has elapsed. User can’t see it.

OffMonitor

Window rect doesn’t intersect any monitor in state.monitors. Off-screen orphan.

OrphanDestroy

ReportHwndDestroyed arrived without a preceding ReportWindowClosed for the matching label. Renderer crashed, took the HWND with it.

LingeringHwnd

ReportWindowClosed arrived, but subsequent OS events for the HWND keep firing (it never went away on the Win32 side).

OrphanInstance

Phase B.9.3 — host process is alive and registered, but state.windows just transitioned to empty. The host’s own close path doesn’t reap the warm pool when the last user-visible window closes (pool windows hold state.browsers non-empty, so quit_message_loop never fires). The launcher’s reducer is the only place that knows “all user-meaningful labels are gone” cleanly, so we surface the signal here. Paired with Event::HostShouldQuit emitted in the same reducer call (see B.9.3 saga).

Trait Implementations

impl Clone for HwndDriftKind

fn clone(&self) -> HwndDriftKind

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for HwndDriftKind

impl Debug for HwndDriftKind

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for HwndDriftKind

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for HwndDriftKind

impl PartialEq for HwndDriftKind

fn eq(&self, other: &HwndDriftKind) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for HwndDriftKind

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for HwndDriftKind