[gnome-boxes] display-toolbar: Handle tranfer popover

[Felipe Borges <felipeborges src gnome org>]

commit beb62e8ca8a8e1c98dcdd3b33d4f75de8e24fcd7
Author: Visarion Alexandru <viorel visarion gmail com>
Date:   Sun Dec 17 19:58:14 2017 +0100

    display-toolbar: Handle tranfer popover
    
    https://bugzilla.gnome.org/show_bug.cgi?id=762321

 src/display-toolbar.vala | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/src/display-toolbar.vala b/src/display-toolbar.vala
index 34597814..b086743c 100644
--- a/src/display-toolbar.vala
+++ b/src/display-toolbar.vala
@@ -89,6 +89,13 @@ public void setup_ui (AppWindow window) {
         });
         keys_menu_button.popover = new KeysInputPopover (window);
         transfers_drawing_area.draw.connect (on_draw);
+        transfers_button.clicked.connect ( () => {
+            var popover = window.display_page.transfer_popover;
+            if (popover.visible)
+                popover.popdown ();
+            else
+                popover.popup ();
+        });
     }
 
     private bool on_draw (Widget da, Cairo.Context ctx) {