[gitg/wip/albfan/diff-long-lines] SourceView needs to be wrapped in a scroll view

[Alberto Fanjul <albfan src gnome org>]

commit 008229e9c4798d2946aca6a9f6dc8742ce876741
Author: Alberto Fanjul <albertofanjul gmail com>
Date:   Sun Oct 31 12:02:33 2021 +0100

    SourceView needs to be wrapped in a scroll view

 libgitg/gitg-diff-view-file.vala | 24 +++++++++++++++++-------
 1 file changed, 17 insertions(+), 7 deletions(-)
---
diff --git a/libgitg/gitg-diff-view-file.vala b/libgitg/gitg-diff-view-file.vala
index fc2ae1bd..7ac01345 100644
--- a/libgitg/gitg-diff-view-file.vala
+++ b/libgitg/gitg-diff-view-file.vala
@@ -36,31 +36,41 @@ class Gitg.DiffViewFile : Gtk.Grid
 
        private Binding? d_vexpand_binding;
 
+       private DiffViewFileRenderer? _renderer;
+
+       private Gtk.ScrolledWindow? scrolled_window;
+
        public DiffViewFileRenderer? renderer
        {
                owned get
                {
-                       return d_revealer_content.get_child() as DiffViewFileRenderer;
+                       return _renderer;
                }
 
                construct set
                {
-                       var current = this.renderer;
-
-                       if (current != value)
+                       if (_renderer != value)
                        {
+                               _renderer = value;
                                if (d_vexpand_binding != null)
                                {
                                        d_vexpand_binding.unbind();
                                        d_vexpand_binding = null;
                                }
 
-                               if (current != null)
+                               if (scrolled_window != null)
                                {
-                                       d_revealer_content.remove(current);
+                                       d_revealer_content.remove(scrolled_window);
                                }
 
-                               d_revealer_content.add(value);
+                               var scrolled_window = new Gtk.ScrolledWindow(null, null);
+                               scrolled_window.set_policy (Gtk.PolicyType.AUTOMATIC, 
Gtk.PolicyType.AUTOMATIC);
+
+                               scrolled_window.add (_renderer);
+                               scrolled_window.set_border_width (5);
+                               scrolled_window.show();
+
+                               d_revealer_content.add(scrolled_window);
                                d_vexpand_binding = this.bind_property("vexpand", value, "vexpand", 
BindingFlags.SYNC_CREATE);
                        }
                }