Attempt to remove the dangeous element focus API

crates/gpui2/src/window.rs

@@ -168,6 +168,7 @@ impl FocusHandle {
         self.id.within_focused(cx)
     }
 
+    // TODO kb now never used?
     /// Obtains whether this handle contains the given handle in the most recently rendered frame.
     pub(crate) fn contains(&self, other: &Self, cx: &WindowContext) -> bool {
         self.id.contains(other.id, cx)