[gnome-builder/wip/gtk4-port] libide/gui: add helper to add content widget

[Christian Hergert <chergert src gnome org>]

commit c53134c3fb62ea0ed41fcc0e7227efe503deab82
Author: Christian Hergert <chergert redhat com>
Date:   Wed Apr 20 16:53:35 2022 -0700

    libide/gui: add helper to add content widget
    
    We need this for cases where we cannot use a template.

 src/libide/gui/ide-page.c | 15 +++++++++++++--
 src/libide/gui/ide-page.h |  3 +++
 2 files changed, 16 insertions(+), 2 deletions(-)
---
diff --git a/src/libide/gui/ide-page.c b/src/libide/gui/ide-page.c
index c09fe9f6a..aa93e592c 100644
--- a/src/libide/gui/ide-page.c
+++ b/src/libide/gui/ide-page.c
@@ -496,6 +496,18 @@ ide_page_get_file_or_directory (IdePage *self)
   return NULL;
 }
 
+void
+ide_page_add_content_widget (IdePage   *self,
+                             GtkWidget *widget)
+{
+  IdePagePrivate *priv = ide_page_get_instance_private (self);
+
+  g_return_if_fail (IDE_IS_PAGE (self));
+  g_return_if_fail (GTK_IS_WIDGET (widget));
+
+  gtk_box_append (priv->content_box, widget);
+}
+
 static void
 ide_page_add_child (GtkBuildable *buildable,
                     GtkBuilder   *builder,
@@ -503,7 +515,6 @@ ide_page_add_child (GtkBuildable *buildable,
                     const char   *name)
 {
   IdePage *self = (IdePage *)buildable;
-  IdePagePrivate *priv = ide_page_get_instance_private (self);
 
   g_assert (IDE_IS_PAGE (self));
   g_assert (GTK_IS_BUILDER (builder));
@@ -513,7 +524,7 @@ ide_page_add_child (GtkBuildable *buildable,
     {
       if (g_strcmp0 (name, "content") == 0)
         {
-          gtk_box_append (priv->content_box, GTK_WIDGET (object));
+          ide_page_add_content_widget (self, GTK_WIDGET (object));
           return;
         }
     }
diff --git a/src/libide/gui/ide-page.h b/src/libide/gui/ide-page.h
index b462d1121..c0bbbafae 100644
--- a/src/libide/gui/ide-page.h
+++ b/src/libide/gui/ide-page.h
@@ -107,5 +107,8 @@ IDE_AVAILABLE_IN_ALL
 void              ide_page_destroy               (IdePage              *self);
 IDE_AVAILABLE_IN_ALL
 void              ide_clear_page                 (IdePage             **location);
+IDE_AVAILABLE_IN_ALL
+void              ide_page_add_content_widget    (IdePage              *self,
+                                                  GtkWidget            *widget);
 
 G_END_DECLS