fix multiselect combobox

go/wasmruntime/host_native.go

@@ -30,6 +30,11 @@ func ScrollIntoView(*vdom.Ref, bool, string) {}
 func ScrollLeft(*vdom.Ref) float64           { return 0 }
 func SetScrollLeft(*vdom.Ref, float64)       {}
 
+// OverflowsX is false on the server: with no layout, nothing can overflow. A
+// component that collapses overflowing content therefore SSRs its uncollapsed form,
+// and the client collapses it on the first commit — before paint, so it is not seen.
+func OverflowsX(*vdom.Ref) bool { return false }
+
 func Contains(*vdom.Ref, any) bool                   { return false }
 func ClosestAttr(any, string, string) (string, bool) { return "", false }
 func QuerySelector(string) *vdom.Ref                 { return vdom.NewRef() }