[polari] Replace get_preferred_width/height with measure()

[Marge Bot <marge-bot src gnome org>]

commit 7646e6ce6d5cfb6be3466f89bc0d4fd27176a615
Author: Florian Müllner <fmuellner gnome org>
Date:   Sat Oct 10 06:03:10 2020 +0200

    Replace get_preferred_width/height with measure()
    
    Part-of: <https://gitlab.gnome.org/GNOME/polari/-/merge_requests/228>

 src/userList.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/userList.js b/src/userList.js
index d35fe886..230bcace 100644
--- a/src/userList.js
+++ b/src/userList.js
@@ -75,8 +75,8 @@ class UserListPopover extends Gtk.Popover {
             return;
 
         const viewHeight = this.get_root().view_height;
-        let [popoverHeight] = this.get_preferred_height();
-        let [userListHeight] = this._userList.get_preferred_height();
+        const [popoverHeight] = this.measure(Gtk.Orientation.VERTICAL, -1);
+        const [userListHeight] = this._userList.measure(Gtk.Orientation.VERTICAL, -1);
         let chromeHeight = popoverHeight - userListHeight;
         this._userList.max_content_height = viewHeight - chromeHeight;
     }