[gnome-mines/arnaudb/wip/gtk4: 14/39] Adapt to Box API.

[Arnaud B. <arnaudb src gnome org>]

commit bd4d1993e764c89fe77e948155cdcec5ae01caf3
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Mon Apr 13 23:00:59 2020 +0200

    Adapt to Box API.

 src/theme-selector-dialog.vala | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/src/theme-selector-dialog.vala b/src/theme-selector-dialog.vala
index 50b492a..af13c61 100644
--- a/src/theme-selector-dialog.vala
+++ b/src/theme-selector-dialog.vala
@@ -95,7 +95,7 @@ public class ThemeSelectorDialog : Gtk.Dialog
         frame.margin_bottom = 6;
         frame.add (view);
         reveal_nonmines (view);
-        box.pack_start (frame, true, true, 0);
+        box.add (frame);
 
         return box;
     }
@@ -119,10 +119,10 @@ public class ThemeSelectorDialog : Gtk.Dialog
 
         var headerbar = get_header_bar () as Gtk.HeaderBar;
         headerbar.set_show_title_buttons (true);
-        get_content_area ().pack_start (create_preview_widget (out minefield), true, true, 0);
+        get_content_area ().add (create_preview_widget (out minefield));
 
-        buttons_holder.pack_start (previous);
-        buttons_holder.pack_start (next);
+        buttons_holder.add (previous);
+        buttons_holder.add (next);
         buttons_holder.get_style_context ().add_class ("linked");
         headerbar.pack_start (buttons_holder);