[vala/staging] gtk4: Update to 4.1.0+2712f536

[Rico Tzschichholz <ricotz src gnome org>]

commit def9a2451550c7574c29c6aa75d73288beb0074c
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Sat Feb 6 17:39:24 2021 +0100

    gtk4: Update to 4.1.0+2712f536

 vapi/gtk4.vapi | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/vapi/gtk4.vapi b/vapi/gtk4.vapi
index b934e24e4..3ed788331 100644
--- a/vapi/gtk4.vapi
+++ b/vapi/gtk4.vapi
@@ -6004,6 +6004,7 @@ namespace Gsk {
        public class ConicGradientNode : Gsk.RenderNode {
                [CCode (has_construct_function = false, type = "GskRenderNode*")]
                public ConicGradientNode (Graphene.Rect bounds, Graphene.Point center, float rotation, [CCode 
(array_length_cname = "n_color_stops", array_length_pos = 4.1, array_length_type = "gsize")] Gsk.ColorStop[] 
color_stops);
+               public float get_angle ();
                public unowned Graphene.Point? get_center ();
                [CCode (array_length_pos = 0.1, array_length_type = "gsize")]
                public unowned Gsk.ColorStop[] get_color_stops ();
@@ -9115,7 +9116,7 @@ namespace Gtk {
                public unowned Gtk.Adjustment get_adjustment ();
                public unowned Gtk.ListBoxRow? get_row_at_index (int index_);
                public unowned Gtk.ListBoxRow? get_row_at_y (int y);
-               public unowned Gtk.ListBoxRow get_selected_row ();
+               public unowned Gtk.ListBoxRow? get_selected_row ();
                public GLib.List<weak Gtk.ListBoxRow> get_selected_rows ();
                public Gtk.SelectionMode get_selection_mode ();
                public bool get_show_separators ();
@@ -12079,7 +12080,7 @@ namespace Gtk {
                public int get_margin_end ();
                public int get_margin_start ();
                public int get_margin_top ();
-               public unowned string? get_name ();
+               public unowned string get_name ();
                public unowned Gtk.Native? get_native ();
                public unowned Gtk.Widget? get_next_sibling ();
                public double get_opacity ();