[shotwell] Remove deprecated gtk_menu_popup call

[Jens Georg <jensgeorg src gnome org>]

commit d821d0f7f2e21866c109b2f6d4974a06fe30bf2c
Author: Jens Georg <mail jensge org>
Date:   Fri Mar 30 09:03:02 2018 +0200

    Remove deprecated gtk_menu_popup call

 src/Page.vala         |    5 +----
 src/SearchFilter.vala |    2 +-
 src/sidebar/Tree.vala |    9 +++------
 3 files changed, 5 insertions(+), 11 deletions(-)
---
diff --git a/src/Page.vala b/src/Page.vala
index ea8606e..05ad483 100644
--- a/src/Page.vala
+++ b/src/Page.vala
@@ -1083,10 +1083,7 @@ public abstract class Page : Gtk.ScrolledWindow {
         if (context_menu == null || !on_context_invoked())
             return false;
 
-        if (event == null)
-            context_menu.popup(null, null, null, 0, Gtk.get_current_event_time());
-        else
-            context_menu.popup(null, null, null, event.button, event.time);
+        context_menu.popup_at_pointer(event);
 
         return true;
     }
diff --git a/src/SearchFilter.vala b/src/SearchFilter.vala
index fba5488..806ca74 100644
--- a/src/SearchFilter.vala
+++ b/src/SearchFilter.vala
@@ -1191,7 +1191,7 @@ public class SearchFilterToolbar : Gtk.Revealer {
     
     // Ticket #3260 part IV - display the context menu on secondary click
     private bool on_context_menu_requested(int x, int y, int button) { 
-        close_menu.popup(null, null, null, button, Gtk.get_current_event_time()); 
+        close_menu.popup_at_pointer(null);
         return false;
     }
     
diff --git a/src/sidebar/Tree.vala b/src/sidebar/Tree.vala
index c707c63..f63c916 100644
--- a/src/sidebar/Tree.vala
+++ b/src/sidebar/Tree.vala
@@ -863,16 +863,13 @@ public class Sidebar.Tree : Gtk.TreeView {
             context_menu.attach_to_widget (this, null);
         }
 
-        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);
+
         return true;
     }
     
     private bool popup_default_context_menu(Gdk.EventButton event) {
-        default_context_menu.popup(null, null, null, event.button, event.time);
+        default_context_menu.popup_at_pointer(event);
         return true;
     }