[gtk/clipboard-demo-improvements] gtk-demo: Small followup fixes

[Matthias Clasen <matthiasc src gnome org>]

commit f8855e892a0ea4964ac08163879f68731bcac623
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Dec 12 13:41:24 2021 -0500

    gtk-demo: Small followup fixes
    
    Make image copy work remotely.

 demos/gtk-demo/clipboard.c  | 21 +++++++++++++++------
 demos/gtk-demo/clipboard.ui |  5 +++++
 2 files changed, 20 insertions(+), 6 deletions(-)
---
diff --git a/demos/gtk-demo/clipboard.c b/demos/gtk-demo/clipboard.c
index f7348bcdc1..4b3dbcb9c2 100644
--- a/demos/gtk-demo/clipboard.c
+++ b/demos/gtk-demo/clipboard.c
@@ -35,7 +35,12 @@ copy_button_clicked (GtkStack *source_stack,
           if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (child)))
             {
               GtkWidget *image = gtk_widget_get_first_child (child);
-              gdk_clipboard_set (clipboard, GDK_TYPE_PAINTABLE, gtk_image_get_paintable (GTK_IMAGE (image)));
+              GdkPaintable *paintable = gtk_image_get_paintable (GTK_IMAGE (image));
+
+              if (GDK_IS_TEXTURE (paintable))
+                gdk_clipboard_set (clipboard, GDK_TYPE_TEXTURE, paintable);
+              else
+                gdk_clipboard_set (clipboard, GDK_TYPE_PAINTABLE, paintable);
               break;
             }
         }
@@ -93,7 +98,8 @@ paste_received (GObject      *source_object,
           color = g_value_get_boxed (value);
           g_object_set (child, "rgba", color, NULL);
         }
-      else if (G_VALUE_HOLDS (value, GDK_TYPE_PAINTABLE))
+      else if (G_VALUE_HOLDS (value, GDK_TYPE_TEXTURE) ||
+               G_VALUE_HOLDS (value, GDK_TYPE_PAINTABLE))
         {
           GdkPaintable *paintable;
 
@@ -128,12 +134,14 @@ paste_button_clicked (GtkStack *dest_stack,
   clipboard = gtk_widget_get_clipboard (GTK_WIDGET (dest_stack));
   formats = gdk_clipboard_get_formats (clipboard);
 
-  if (gdk_content_formats_contain_gtype (formats, G_TYPE_FILE))
-    gdk_clipboard_read_value_async (clipboard, G_TYPE_FILE, 0, NULL, paste_received, dest_stack);
-  else if (gdk_content_formats_contain_gtype (formats, GDK_TYPE_RGBA))
-    gdk_clipboard_read_value_async (clipboard, GDK_TYPE_RGBA, 0, NULL, paste_received, dest_stack);
+  if (gdk_content_formats_contain_gtype (formats, GDK_TYPE_TEXTURE))
+    gdk_clipboard_read_value_async (clipboard, GDK_TYPE_TEXTURE, 0, NULL, paste_received, dest_stack);
   else if (gdk_content_formats_contain_gtype (formats, GDK_TYPE_PAINTABLE))
     gdk_clipboard_read_value_async (clipboard, GDK_TYPE_PAINTABLE, 0, NULL, paste_received, dest_stack);
+  else if (gdk_content_formats_contain_gtype (formats, GDK_TYPE_RGBA))
+    gdk_clipboard_read_value_async (clipboard, GDK_TYPE_RGBA, 0, NULL, paste_received, dest_stack);
+  else if (gdk_content_formats_contain_gtype (formats, G_TYPE_FILE))
+    gdk_clipboard_read_value_async (clipboard, G_TYPE_FILE, 0, NULL, paste_received, dest_stack);
   else if (gdk_content_formats_contain_gtype (formats, G_TYPE_STRING))
     gdk_clipboard_read_value_async (clipboard, G_TYPE_STRING, 0, NULL, paste_received, dest_stack);
 }
@@ -240,6 +248,7 @@ update_paste_button_sensitivity (GdkClipboard *clipboard,
 
   if (gdk_content_formats_contain_gtype (formats, G_TYPE_FILE) ||
       gdk_content_formats_contain_gtype (formats, GDK_TYPE_RGBA) ||
+      gdk_content_formats_contain_gtype (formats, GDK_TYPE_TEXTURE) ||
       gdk_content_formats_contain_gtype (formats, GDK_TYPE_PAINTABLE) ||
       gdk_content_formats_contain_gtype (formats, G_TYPE_STRING))
     sensitive = TRUE;
diff --git a/demos/gtk-demo/clipboard.ui b/demos/gtk-demo/clipboard.ui
index 08fa51e9f8..1930fb4fda 100644
--- a/demos/gtk-demo/clipboard.ui
+++ b/demos/gtk-demo/clipboard.ui
@@ -180,6 +180,7 @@
             <child>
               <object class="GtkStack" id="dest_stack">
                 <property name="halign">end</property>
+                <property name="valign">center</property>
                 <child>
                   <object class="GtkStackPage">
                     <property name="name"></property>
@@ -195,6 +196,7 @@
                     <property name="child">
                       <object class="GtkLabel">
                         <property name="halign">end</property>
+                        <property name="valign">center</property>
                         <property name="xalign">0</property>
                         <property name="ellipsize">end</property>
                       </object>
@@ -207,6 +209,7 @@
                     <property name="child">
                       <object class="GtkImage">
                         <property name="halign">end</property>
+                        <property name="valign">center</property>
                         <style>
                           <class name="large-icons"/>
                         </style>
@@ -220,6 +223,7 @@
                     <property name="child">
                       <object class="GtkBox">
                         <property name="halign">end</property>
+                        <property name="valign">center</property>
                         <child>
                           <object class="GtkColorSwatch">
                             <property name="accessible-role">img</property>
@@ -238,6 +242,7 @@
                     <property name="child">
                       <object class="GtkLabel">
                         <property name="halign">end</property>
+                        <property name="valign">center</property>
                         <property name="xalign">0</property>
                         <property name="hexpand">1</property>
                         <property name="ellipsize">start</property>