[ghex/ghex-42] hexwidget: Fix redraw on keyboard focus change

[Logan Rathbone <larathbone src gnome org>]

commit 92e7eac33311e3ac4efc60d9dbd48991e88be2f8
Author: Logan Rathbone <poprocks gmail com>
Date:   Tue Apr 19 00:28:17 2022 -0400

    hexwidget: Fix redraw on keyboard focus change
    
    (cherry picked from commit c1782266dc34f91b05a999ca9e9c2583184897a8)

 src/gtkhex.c | 11 +++++++++++
 1 file changed, 11 insertions(+)
---
diff --git a/src/gtkhex.c b/src/gtkhex.c
index c34b57f..b155838 100644
--- a/src/gtkhex.c
+++ b/src/gtkhex.c
@@ -2951,6 +2951,17 @@ hex_widget_init (HexWidget *self)
        gtk_widget_add_controller (widget,
                        GTK_EVENT_CONTROLLER(controller));
 
+       /* Event controller - focus */
+
+       controller = gtk_event_controller_focus_new ();
+
+       g_signal_connect_swapped (controller, "enter",
+                       G_CALLBACK(gtk_widget_queue_draw), widget);
+       g_signal_connect_swapped (controller, "leave",
+                       G_CALLBACK(gtk_widget_queue_draw), widget);
+
+       gtk_widget_add_controller (widget, GTK_EVENT_CONTROLLER(controller));
+
        /* Connect signal for adjustment */
 
        g_signal_connect (self->adj, "value-changed",