[gtk/wip/matthiasc/focus2: 17/21] window: Make focus wrap again

[Matthias Clasen <matthiasc src gnome org>]

commit 407a78d6e7743dc44469fbdbc0fd6b09ee24bf1e
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Mar 2 20:18:33 2019 -0500

    window: Make focus wrap again
    
    This is the traditional GTK behavior: wrap around when
    the focus reaches the end of the toplevel's focus chain.

 gtk/gtkwindow.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
---
diff --git a/gtk/gtkwindow.c b/gtk/gtkwindow.c
index 36ac49ff95..0083802361 100644
--- a/gtk/gtkwindow.c
+++ b/gtk/gtkwindow.c
@@ -767,6 +767,27 @@ gtk_window_pick (GtkWidget *widget,
   return GTK_WIDGET_CLASS (gtk_window_parent_class)->pick (widget, x, y);
 }
 
+static GtkWidget *
+gtk_window_next_focus_child (GtkWidget        *widget,
+                             GtkWidget        *child,
+                             GtkDirectionType  direction)
+{
+  GtkWidget *next;
+
+  next = GTK_WIDGET_CLASS (gtk_window_parent_class)->next_focus_child (widget, child, direction);
+  if (next)
+    return next;
+
+  switch ((int)direction)
+    {
+    case GTK_DIR_TAB_FORWARD:
+    case GTK_DIR_TAB_BACKWARD:
+      return GTK_WIDGET_CLASS (gtk_window_parent_class)->next_focus_child (widget, NULL, direction);
+    default:
+      return NULL;
+    }
+}
+
 static void
 gtk_window_class_init (GtkWindowClass *klass)
 {
@@ -805,6 +826,7 @@ gtk_window_class_init (GtkWindowClass *klass)
   widget_class->style_updated = gtk_window_style_updated;
   widget_class->snapshot = gtk_window_snapshot;
   widget_class->pick = gtk_window_pick;
+  widget_class->next_focus_child = gtk_window_next_focus_child;
 
   container_class->add = gtk_window_add;
   container_class->remove = gtk_window_remove;