feat(hmr): reload and force slot update on re-render

packages/runtime-core/src/componentRenderUtils.ts

@@ -111,10 +111,25 @@ export function renderComponentRoot(
 export function shouldUpdateComponent(
   prevVNode: VNode,
   nextVNode: VNode,
+  parentComponent: ComponentInternalInstance | null,
   optimized?: boolean
 ): boolean {
   const { props: prevProps, children: prevChildren } = prevVNode
   const { props: nextProps, children: nextChildren, patchFlag } = nextVNode
+
+  // Parent component's render function was hot-updated. Since this may have
+  // caused the child component's slots content to have changed, we need to
+  // force the child to update as well.
+  if (
+    __BUNDLER__ &&
+    __DEV__ &&
+    (prevChildren || nextChildren) &&
+    parentComponent &&
+    parentComponent.renderUpdated
+  ) {
+    return true
+  }
+
   if (patchFlag > 0) {
     if (patchFlag & PatchFlags.DYNAMIC_SLOTS) {
       // slot content that references values that might have changed,