flatpak: Build recent GTK 4.6.2 version

We are gonna move into depending on at least 4.6.0, build it for CI to pass

pkgs/flatpak/com.github.rafostar.Clapper.json

@@ -35,7 +35,7 @@
         "flathub/lib/uchardet.json",
         "testing/libsoup3.json",
         "flathub/gstreamer-1.0/gstreamer.json",
-        "flathub/lib/gtk4.json",
+        "testing/gtk4.json",
         "flathub/lib/libadwaita.json",
         "testing/gtuber.json",
         {

pkgs/flatpak/testing/gtk4-popover-unrealize.patch

@@ -0,0 +1,31 @@
+From b413ee2c7d458c7005d3d3d1da8822cd86893ac0 Mon Sep 17 00:00:00 2001
+From: Rafostar <40623528+Rafostar@users.noreply.github.com>
+Date: Fri, 4 Dec 2020 19:25:34 +0100
+Subject: [PATCH] popover: Call unrealize on hide
+
+When popover is shown "realize" method is called which creates a new
+surface for popup. Unfortunately this causes performance drop on Wayland until that
+surface is destroyed what happens inside "unrealize" method during popover destruction.
+
+This commit changes default behavior in a way that surface will be destroyed
+when popover is closed and app will ragain the performance it lost when
+popover was shown.
+---
+ gtk/gtkpopover.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/gtk/gtkpopover.c b/gtk/gtkpopover.c
+index 504dcd6cc1..a7a764d483 100644
+--- a/gtk/gtkpopover.c
++++ b/gtk/gtkpopover.c
+@@ -951,6 +951,7 @@ gtk_popover_hide (GtkWidget *widget)
+ 
+   gtk_popover_set_mnemonics_visible (GTK_POPOVER (widget), FALSE);
+   _gtk_widget_set_visible_flag (widget, FALSE);
++  gtk_widget_unrealize (widget);
+   gtk_widget_unmap (widget);
+   g_signal_emit (widget, signals[CLOSED], 0);
+ }
+-- 
+GitLab
+

pkgs/flatpak/testing/gtk4.json

@@ -0,0 +1,33 @@
+{
+    "name": "gtk",
+    "buildsystem": "meson",
+    "config-opts": [
+        "--buildtype=release",
+        "--wrap-mode=nofallback",
+
+        "-Dwin32-backend=false",
+        "-Dmacos-backend=false",
+        "-Dmedia-ffmpeg=disabled",
+        "-Dprint-cups=disabled",
+        "-Dintrospection=enabled",
+        "-Ddemos=false",
+        "-Dbuild-examples=false",
+        "-Dbuild-tests=false"
+    ],
+    "cleanup": [
+        "/bin/gtk4-builder-tool",
+        "/bin/gtk4-encode-symbolic-svg"
+    ],
+    "sources": [
+        {
+            "type": "git",
+            "url": "https://gitlab.gnome.org/GNOME/gtk.git",
+            "tag": "4.6.2",
+            "commit": "aec7ca82007dbe07faee6be084d20758ebac2b91"
+        },
+        {
+            "type": "patch",
+            "path": "gtk4-popover-unrealize.patch"
+        }
+    ]
+}