[baobab] Do not use deprecated popup functions

[Stefano Facchini <sfacchini src gnome org>]

commit ba19ac54c92211338368a21e148e2ccd13924b3c
Author: Stefano Facchini <stefano facchini gmail com>
Date:   Wed Jun 10 09:54:57 2020 +0200

    Do not use deprecated popup functions

 src/baobab-chart.vala  | 6 +-----
 src/baobab-window.vala | 6 +++---
 2 files changed, 4 insertions(+), 8 deletions(-)
---
diff --git a/src/baobab-chart.vala b/src/baobab-chart.vala
index 4c0e24c..f27f610 100644
--- a/src/baobab-chart.vala
+++ b/src/baobab-chart.vala
@@ -599,11 +599,7 @@ namespace Baobab {
             action = action_group.lookup_action ("zoom-out") as SimpleAction;
             action.set_enabled (can_zoom_out ());
 
-            if (event != null) {
-                context_menu.popup (null, null, null, event.button, event.time);
-            } else {
-                context_menu.popup (null, null, null, 0, Gtk.get_current_event_time ());
-            }
+            context_menu.popup_at_pointer (event);
         }
 
         void connect_model_signals (Gtk.TreeModel m) {
diff --git a/src/baobab-window.vala b/src/baobab-window.vala
index 836a414..5d6c412 100644
--- a/src/baobab-window.vala
+++ b/src/baobab-window.vala
@@ -363,12 +363,12 @@ namespace Baobab {
 
         bool show_treeview_popup (Gtk.Menu popup, Gdk.EventButton? event) {
             if (event != null) {
-                popup.popup (null, null, null, event.button, event.time);
+                popup.popup_at_pointer (event);
             } else {
-                popup.popup (null, null, null, 0, Gtk.get_current_event_time ());
+                popup.popup_at_widget (treeview, Gdk.Gravity.CENTER, Gdk.Gravity.CENTER);
                 popup.select_first (false);
             }
-            return true;
+            return Gdk.EVENT_STOP;
         }
 
         public void open_item (Gtk.TreeIter iter) {