fix(app): prevent stale session hover preview on refocus (#18727)

packages/app/src/pages/layout.tsx

@@ -211,13 +211,22 @@ export default function Layout(props: ParentProps) {
 
   onMount(() => {
     const stop = () => setState("sizing", false)
+    const blur = () => reset()
+    const hide = () => {
+      if (document.visibilityState !== "hidden") return
+      reset()
+    }
     window.addEventListener("pointerup", stop)
     window.addEventListener("pointercancel", stop)
     window.addEventListener("blur", stop)
+    window.addEventListener("blur", blur)
+    document.addEventListener("visibilitychange", hide)
     onCleanup(() => {
       window.removeEventListener("pointerup", stop)
       window.removeEventListener("pointercancel", stop)
       window.removeEventListener("blur", stop)
+      window.removeEventListener("blur", blur)
+      document.removeEventListener("visibilitychange", hide)
     })
   })
 
@@ -237,6 +246,12 @@ export default function Layout(props: ParentProps) {
     navLeave.current = undefined
   }
 
+  const reset = () => {
+    disarm()
+    setState("hoverSession", undefined)
+    setHoverProject(undefined)
+  }
+
   const arm = () => {
     if (layout.sidebar.opened()) return
     if (state.hoverProject === undefined) return
@@ -305,8 +320,7 @@ export default function Layout(props: ParentProps) {
 
   const clearSidebarHoverState = () => {
     if (layout.sidebar.opened()) return
-    setState("hoverSession", undefined)
-    setHoverProject(undefined)
+    reset()
   }
 
   const navigateWithSidebarReset = (href: string) => {

packages/app/src/pages/layout/sidebar-items.tsx

@@ -157,16 +157,26 @@ const SessionHoverPreview = (props: {
   messageLabel: (message: Message) => string | undefined
   onMessageSelect: (message: Message) => void
   trigger: JSX.Element
-}): JSX.Element => (
+}): JSX.Element => {
+  let ref: HTMLDivElement | undefined
+
+  return (
     <HoverCard
       openDelay={1000}
       closeDelay={props.sidebarHovering() ? 600 : 0}
       placement="right-start"
       gutter={16}
       shift={-2}
-    trigger={props.trigger}
+      trigger={<div ref={ref}>{props.trigger}</div>}
       open={props.hoverSession() === props.session.id}
-    onOpenChange={(open) => props.setHoverSession(open ? props.session.id : undefined)}
+      onOpenChange={(open) => {
+        if (!open) {
+          props.setHoverSession(undefined)
+          return
+        }
+        if (!ref?.matches(":hover")) return
+        props.setHoverSession(props.session.id)
+      }}
     >
       <Show
         when={props.hoverReady()}
@@ -185,6 +195,7 @@ const SessionHoverPreview = (props: {
       </Show>
     </HoverCard>
   )
+}
 
 export const SessionItem = (props: SessionItemProps): JSX.Element => {
   const params = useParams()