editor: Ensure code actions menu doesn't grow beyond its max size (#35211)

This resolves the same issue as fixed by
https://github.com/zed-industries/zed/pull/34939/commits/d295409f0fc9c1ccd5e06e91c1c5365e96f16486
for the code actions menu.

No release notes since this only occurs on Nightly.

Release Notes:

- N/A

crates/ui/src/components/popover.rs

@@ -50,7 +50,7 @@ impl RenderOnce for Popover {
                 v_flex()
                     .elevation_2(cx)
                     .py(POPOVER_Y_PADDING / 2.)
-                    .children(self.children),
+                    .child(div().children(self.children)),
             )
             .when_some(self.aside, |this, aside| {
                 this.child(