[gnome-shell] dash: Consider additions for separator visibility

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

commit 9aa25eaa0b7fe85b6edead3dbb42bac8d3103aa0
Author: Florian Müllner <fmuellner gnome org>
Date:   Tue Feb 9 21:48:39 2021 +0100

    dash: Consider additions for separator visibility
    
    The children variable holds the icons that were originally in
    the dash. For the separator visibility, we should consider the
    icons that are in the dash after the update, so we must consider
    additions as well as removals.
    
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1659>

 js/ui/dash.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/js/ui/dash.js b/js/ui/dash.js
index 16893f9765..6b4c114e79 100644
--- a/js/ui/dash.js
+++ b/js/ui/dash.js
@@ -745,7 +745,7 @@ var Dash = GObject.registerClass({
 
         // Update separator
         const nFavorites = Object.keys(favorites).length;
-        const nIcons = children.length - removedActors.length;
+        const nIcons = children.length + addedItems.length - removedActors.length;
         if (nFavorites > 0 && nFavorites < nIcons) {
             if (!this._separator) {
                 this._separator = new St.Widget({