workspaceThumbnail: Queue state update after expanding

New workspaces are added in two steps, first the minimap expands to make
room for the new thumbnail, then the thumbnail animates in. However we
currently don't queue a state update after the first step, so the second
one only happens after one is queued by some other event (like a workspace
switch).

https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/3748

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1716>

js/ui/workspaceThumbnail.js

@@ -1208,6 +1208,7 @@ var ThumbnailsBox = GObject.registerClass({
                 mode: Clutter.AnimationMode.EASE_OUT_QUAD,
                 onComplete: () => {
                     this._setThumbnailState(thumbnail, ThumbnailState.EXPANDED);
+                    this._queueUpdateStates();
                 },
             });
         });