allView: Redisplay on folder changes

Now that redisplaying is a lightweight operation that only
adds and removes what changed, we can not be concerned about
redisplaying on folder changes.

Redisplaying will be necessary when custom order in the app
grid is implemented, in order to update not only which icons
are hidden, but also their position.

Call _redisplay() in AllView when folders change.

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/645

js/ui/appDisplay.js

@@ -386,7 +386,7 @@ var AllView = class AllView extends BaseAppView {
             if (!icon) {
                 icon = new FolderIcon(id, path, this);
                 icon.connect('name-changed', this._itemNameChanged.bind(this));
-                icon.connect('apps-changed', this._refilterApps.bind(this));
+                icon.connect('apps-changed', this._redisplay.bind(this));
             }
             newApps.push(icon);
             this.folderIcons.push(icon);