[gtk/matthiasc/for-master] gtk-demo: Drop the modelbutton demo

[Matthias Clasen <matthiasc src gnome org>]

commit 79f06879296a4553a9b29f442db6d715456fde17
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Aug 9 10:59:22 2020 -0400

    gtk-demo: Drop the modelbutton demo
    
    Not a public api, so shouldn't be featured in a demo.

 demos/gtk-demo/demo.gresource.xml |   4 --
 demos/gtk-demo/meson.build        |   1 -
 demos/gtk-demo/modelbutton.c      |  66 -------------------
 demos/gtk-demo/modelbutton.ui     | 133 --------------------------------------
 4 files changed, 204 deletions(-)
---
diff --git a/demos/gtk-demo/demo.gresource.xml b/demos/gtk-demo/demo.gresource.xml
index 0ec808bd96..4cfc704db5 100644
--- a/demos/gtk-demo/demo.gresource.xml
+++ b/demos/gtk-demo/demo.gresource.xml
@@ -229,7 +229,6 @@
     <file>listview_words.c</file>
     <file>list_store.c</file>
     <file>markup.c</file>
-    <file>modelbutton.c</file>
     <file>overlay.c</file>
     <file>overlay2.c</file>
     <file>paint.c</file>
@@ -310,9 +309,6 @@
   <gresource prefix="/scale">
     <file>scale.ui</file>
   </gresource>
-  <gresource prefix="/modelbutton">
-    <file>modelbutton.ui</file>
-  </gresource>
   <gresource prefix="/tagged_entry">
     <file>demotaggedentry.c</file>
     <file>demotaggedentry.h</file>
diff --git a/demos/gtk-demo/meson.build b/demos/gtk-demo/meson.build
index 0b419edb21..8eaf7090da 100644
--- a/demos/gtk-demo/meson.build
+++ b/demos/gtk-demo/meson.build
@@ -51,7 +51,6 @@ demos = files([
   'listview_weather.c',
   'listview_words.c',
   'markup.c',
-  'modelbutton.c',
   'overlay.c',
   'overlay2.c',
   'paint.c',