[gnome-boxes] icon-view: Set action popover relative to thumbnail

[Felipe Borges <felipeborges src gnome org>]

commit 1847faaaf0be37bd4a1d7833648074b559f49b36
Author: Felipe Borges <felipeborges gnome org>
Date:   Thu Jan 4 14:31:45 2018 +0100

    icon-view: Set action popover relative to thumbnail
    
    This way we can guarantee that the popover won't be weirdly
    positioned based on the length of the machine name.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=791839

 src/icon-view-child.vala |    4 ++--
 src/icon-view.vala       |    4 +++-
 2 files changed, 5 insertions(+), 3 deletions(-)
---
diff --git a/src/icon-view-child.vala b/src/icon-view-child.vala
index 473a2b1..778aacc 100644
--- a/src/icon-view-child.vala
+++ b/src/icon-view-child.vala
@@ -35,7 +35,7 @@ private class Boxes.IconViewChild : Gtk.Box {
     [GtkChild]
     private Gtk.Stack stack;
     [GtkChild]
-    private Gtk.Image thumbnail;
+    public Gtk.Image thumbnail;
     [GtkChild]
     private Gtk.Spinner spinner;
     [GtkChild]
@@ -88,4 +88,4 @@ private class Boxes.IconViewChild : Gtk.Box {
         else
             favorite.clear ();
     }
-}
\ No newline at end of file
+}
diff --git a/src/icon-view.vala b/src/icon-view.vala
index ead02ac..28cbf35 100644
--- a/src/icon-view.vala
+++ b/src/icon-view.vala
@@ -201,8 +201,10 @@ private class Boxes.IconView: Gtk.ScrolledWindow, Boxes.ICollectionView, Boxes.U
         if (item == null)
             return false;
 
+        var thumbnail = (child.get_child () as IconViewChild).thumbnail;
+
         context_popover.update_for_item (item);
-        context_popover.set_relative_to (child);
+        context_popover.set_relative_to (thumbnail);
         context_popover.show ();
 
         return true;