[polari] placeholder: Add placeholder to Add Network section

[Gitlab Administrative User <gitlab src gnome org>]

commit 8cf45802c56eec49126c7a254308990e13f946f1
Author: Augusto Cesar <augusto cms7 gmail com>
Date:   Wed Dec 7 13:05:26 2016 -0200

    placeholder: Add placeholder to Add Network section
    
    The "Add Network" section of Polari's join dialog doesn't give any
    feedback when the search does not return any results.
    
    To fix this, add a GTK box with the looking glass icon and a label
    giving the proper feedback as a placeholder in the connections list.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=762892

 src/connections.js | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
---
diff --git a/src/connections.js b/src/connections.js
index 1c712dd..86f7b4a 100644
--- a/src/connections.js
+++ b/src/connections.js
@@ -98,6 +98,20 @@ var ConnectionsList = GObject.registerClass({
         this._list.set_header_func(Lang.bind(this, this._updateHeader));
         this._list.set_sort_func(Lang.bind(this, this._sort));
 
+        let placeholder = new Gtk.Box({ halign: Gtk.Align.CENTER,
+                                        valign: Gtk.Align.CENTER,
+                                        orientation: Gtk.Orientation.VERTICAL,
+                                        visible: true });
+        placeholder.add(new Gtk.Image({ icon_name: 'edit-find-symbolic',
+                                        pixel_size : 115,
+                                        visible : true }));
+        placeholder.add(new Gtk.Label({ label : _("No results."),
+                                        visible : true}));
+
+        placeholder.get_style_context().add_class('dim-label');
+
+        this._list.set_placeholder(placeholder);
+
         this._accountsMonitor = AccountsMonitor.getDefault();
         this._accountsMonitor.connect('account-added', (mon, account) => {
             this._setAccountRowSensitive(account, false);