pub fn navigation_split_view(
sidebar: &ViewHandle,
detail: &ViewHandle,
) -> ViewHandleExpand description
NavigationSplitView { sidebar } detail: { detail }.
Two content closures, so two (fn, ctx) pairs fill x0–x3 and the four generic
words land in x4–x7 with nothing spilled. Content == EmptyView is pinned by
this overload, so only Sidebar and Detail are passed.