[balsa/gtk4: 178/312] mime-widget-vcalendar: Stop using GtkButtonBox

[Peter Bloomfield <peterb src gnome org>]

commit e982270037610a2b4eaf04f3174b4cd081c309ea
Author: Peter Bloomfield <PeterBloomfield bellsouth net>
Date:   Sat Aug 29 15:04:44 2020 -0400

    mime-widget-vcalendar: Stop using GtkButtonBox

 src/balsa-mime-widget-vcalendar.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)
---
diff --git a/src/balsa-mime-widget-vcalendar.c b/src/balsa-mime-widget-vcalendar.c
index 1288507cf..6c204fe05 100644
--- a/src/balsa-mime-widget-vcalendar.c
+++ b/src/balsa-mime-widget-vcalendar.c
@@ -251,6 +251,7 @@ balsa_vevent_widget(LibBalsaVEvent *event, LibBalsaVCal *vcal, gboolean may_repl
        GtkWidget *label;
        GtkWidget *bbox;
        GtkWidget *button;
+        GtkSizeGroup *size_group;
 
        /* add the callback data to the event object */
        g_object_set_data_full(G_OBJECT(event), "ev:sender",
@@ -268,7 +269,9 @@ balsa_vevent_widget(LibBalsaVEvent *event, LibBalsaVCal *vcal, gboolean may_repl
         bbox = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 0);
        gtk_container_add(GTK_CONTAINER(box), bbox);
 
-        button = libbalsa_add_mnemonic_button_to_box(_("Accept"), bbox, GTK_ALIGN_CENTER);
+        size_group = gtk_size_group_new(GTK_SIZE_GROUP_BOTH);
+
+        button = libbalsa_button_box_button(_("Accept"), size_group, GTK_ALIGN_CENTER);
        g_object_set_data(G_OBJECT(button), "event", event);
 
        /* Note: we must ref the full VCal object here as time zone information is stored in it.  Only 
ref'ing the event would thus
@@ -280,14 +283,14 @@ balsa_vevent_widget(LibBalsaVEvent *event, LibBalsaVCal *vcal, gboolean may_repl
        g_signal_connect(button, "clicked",
                         G_CALLBACK(vevent_reply), bbox);
 
-        button = libbalsa_add_mnemonic_button_to_box(_("Accept tentatively"), bbox, GTK_ALIGN_CENTER);
+        button = libbalsa_button_box_button(_("Accept tentatively"), size_group, GTK_ALIGN_CENTER);
        g_object_set_data(G_OBJECT(button), "event", event);
        g_object_set_data(G_OBJECT(button), "mode",
                          GINT_TO_POINTER(ICAL_PARTSTAT_TENTATIVE));
        g_signal_connect(button, "clicked",
                         G_CALLBACK(vevent_reply), bbox);
 
-        button = libbalsa_add_mnemonic_button_to_box(_("Decline"), bbox, GTK_ALIGN_CENTER);
+        button = libbalsa_button_box_button(_("Decline"), size_group, GTK_ALIGN_CENTER);
        g_object_set_data(G_OBJECT(button), "event", event);
        g_object_set_data(G_OBJECT(button), "mode",
                          GINT_TO_POINTER(ICAL_PARTSTAT_DECLINED));