zeta: Improve UX for simultaneous LSP and prediction completions (#24024)

Release Notes:

- N/A

---------

Co-authored-by: Michael Sloan <michael@zed.dev>
Co-authored-by: Danilo <danilo@zed.dev>
Co-authored-by: Richard <richard@zed.dev>

crates/editor/src/inlay_hint_cache.rs

@@ -1253,7 +1253,7 @@ fn apply_hint_update(
         editor.inlay_hint_cache.version += 1;
     }
     if displayed_inlays_changed {
-        editor.splice_inlays(to_remove, to_insert, cx)
+        editor.splice_inlays(&to_remove, to_insert, cx)
     }
 }