commit f35387716481b79c353f098cb80ded665bd7d399
Author: Cody Russell <cody@jhu.edu>
Date:   Sat Feb 28 11:27:07 2015 -0600

    GtkNSView should only unset the first responder if either it is
    our embedded view or if our toplevel window is no longer focused.

diff --git a/gtk/gtknsview.c b/gtk/gtknsview.c
index b325bda..645231d 100644
--- a/gtk/gtknsview.c
+++ b/gtk/gtknsview.c
@@ -534,6 +534,7 @@ gtk_ns_view_notify (GObject    *object,
                     GParamSpec *pspec)
 {
   GtkNSView *ns_view = GTK_NS_VIEW (object);
+  GtkWindow *window = GTK_WINDOW (gtk_widget_get_toplevel (GTK_WIDGET (object)));

   if (G_OBJECT_CLASS (gtk_ns_view_parent_class)->notify)
     G_OBJECT_CLASS (gtk_ns_view_parent_class)->notify (object, pspec);
@@ -550,7 +551,7 @@ gtk_ns_view_notify (GObject    *object,

       if (gtk_widget_has_focus (GTK_WIDGET (object)))
         [ns_window makeFirstResponder:ns_view->priv->view];
-      else
+      else if ([ns_window firstResponder] == ns_view->priv->view || !gtk_window_is_active (window))
         [ns_window makeFirstResponder:nil];
     }
 }