[vala/0.48] gtk4: Mark optional methods of Gdk.Paintable interface as virtual

[Rico Tzschichholz <ricotz src gnome org>]

commit 1353c3c8bac0efdb0d538ae214aad5d1cfeedcfe
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Tue Jun 30 08:03:48 2020 +0200

    gtk4: Mark optional methods of Gdk.Paintable interface as virtual
    
    Fixes https://gitlab.gnome.org/GNOME/vala/issues/1021

 vapi/gtk4.vapi                 | 10 +++++-----
 vapi/metadata/Gdk-4.0.metadata |  5 +++++
 2 files changed, 10 insertions(+), 5 deletions(-)
---
diff --git a/vapi/gtk4.vapi b/vapi/gtk4.vapi
index d41e933e9..f7f1d2e95 100644
--- a/vapi/gtk4.vapi
+++ b/vapi/gtk4.vapi
@@ -5391,11 +5391,11 @@ namespace Gdk {
                public void compute_concrete_size (double specified_width, double specified_height, double 
default_width, double default_height, out double concrete_width, out double concrete_height);
                [CCode (cname = "gdk_paintable_new_empty")]
                public static Gdk.Paintable empty (int intrinsic_width, int intrinsic_height);
-               public abstract Gdk.Paintable get_current_image ();
-               public abstract Gdk.PaintableFlags get_flags ();
-               public abstract double get_intrinsic_aspect_ratio ();
-               public abstract int get_intrinsic_height ();
-               public abstract int get_intrinsic_width ();
+               public virtual Gdk.Paintable get_current_image ();
+               public virtual Gdk.PaintableFlags get_flags ();
+               public virtual double get_intrinsic_aspect_ratio ();
+               public virtual int get_intrinsic_height ();
+               public virtual int get_intrinsic_width ();
                public static Gdk.Paintable new_empty (int intrinsic_width, int intrinsic_height);
                public abstract void snapshot (Gdk.Snapshot snapshot, double width, double height);
                [HasEmitter]
diff --git a/vapi/metadata/Gdk-4.0.metadata b/vapi/metadata/Gdk-4.0.metadata
index 0f3b2f4cf..fdee074d5 100644
--- a/vapi/metadata/Gdk-4.0.metadata
+++ b/vapi/metadata/Gdk-4.0.metadata
@@ -17,6 +17,11 @@ Event
         ._get_distance skip
 Paintable
         .new_empty name="empty"
+        .get_current_image#virtual_method virtual
+        .get_flags#virtual_method virtual
+        .get_intrinsic_width#virtual_method virtual
+        .get_intrinsic_height#virtual_method virtual
+        .get_intrinsic_aspect_ratio#virtual_method virtual
 PaintableFlags cprefix="GDK_PAINTABLE_"
         .size name="STATIC_SIZE"
         .contents name="STATIC_CONTENTS"