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/movement.rs

@@ -864,7 +864,7 @@ mod tests {
             })
             .collect();
         let snapshot = display_map.update(cx, |map, cx| {
-            map.splice_inlays(Vec::new(), inlays, cx);
+            map.splice_inlays(&[], inlays, cx);
             map.snapshot(cx)
         });