[gnome-builder/wip/gtk4-port] libide/greeter: use AdwWindowTitle

[Christian Hergert <chergert src gnome org>]

commit aeb42f130fc898d3007aa2d828e20e1fee3ec464
Author: Christian Hergert <chergert redhat com>
Date:   Wed Mar 30 13:58:57 2022 -0700

    libide/greeter: use AdwWindowTitle

 src/libide/greeter/ide-greeter-workspace.c  |  4 ++--
 src/libide/greeter/ide-greeter-workspace.ui | 13 ++-----------
 2 files changed, 4 insertions(+), 13 deletions(-)
---
diff --git a/src/libide/greeter/ide-greeter-workspace.c b/src/libide/greeter/ide-greeter-workspace.c
index b96257627..3de902ae4 100644
--- a/src/libide/greeter/ide-greeter-workspace.c
+++ b/src/libide/greeter/ide-greeter-workspace.c
@@ -63,7 +63,7 @@ struct _IdeGreeterWorkspace
   GtkButton                *select_button;
   GtkActionBar             *action_bar;
   GtkActionBar             *projects_action_bar;
-  GtkLabel                 *title;
+  AdwWindowTitle           *title;
   IdeGreeterButtonsSection *buttons_section;
   DzlEmptyState            *empty_state;
   GtkGestureMultiPress     *multipress_gesture;
@@ -216,7 +216,7 @@ stack_notify_visible_child_cb (IdeGreeterWorkspace *self,
         full_title = g_strdup_printf (_("Builder — %s"), title);
     }
 
-  gtk_label_set_label (self->title, title);
+  adw_window_title_set_title (self->title, title);
   gtk_window_set_title (GTK_WINDOW (self), full_title);
 
   sections = ide_str_equal0 ("sections", gtk_stack_get_visible_child_name (stack));
diff --git a/src/libide/greeter/ide-greeter-workspace.ui b/src/libide/greeter/ide-greeter-workspace.ui
index f615eec1b..a27540d7b 100644
--- a/src/libide/greeter/ide-greeter-workspace.ui
+++ b/src/libide/greeter/ide-greeter-workspace.ui
@@ -1,21 +1,12 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <interface>
-  <!-- interface-requires gtk+ 3.24 -->
+  <requires lib="gtk" version="4.0"/>
   <template class="IdeGreeterWorkspace" parent="IdeWorkspace">
     <child type="titlebar">
       <object class="IdeHeaderBar" id="header_bar">
         <property name="menu-id">ide-greeter-workspace-menu</property>
-        <property name="show-fullscreen-button">false</property>
-        <property name="show-close-button">true</property>
-        <property name="visible">true</property>
         <child type="title">
-          <object class="GtkLabel" id="title">
-            <property name="visible">true</property>
-            <property name="hexpand">true</property>
-            <style>
-              <class name="title"/>
-            </style>
-          </object>
+          <object class="AdwWindowTitle" id="title"/>
         </child>
         <child type="left">
           <object class="GtkButton" id="back_button">