[gitg] diff-view: hide expander with just one file

[Ignacio Casal Quinteiro <icq src gnome org>]

commit e95db3db333bd7a47f39822938a0fd1f75e1c6e3
Author: Ignacio Casal Quinteiro <icq gnome org>
Date:   Thu Aug 27 12:22:26 2015 +0200

    diff-view: hide expander with just one file

 libgitg/gitg-diff-view-commit-details.vala |    6 ++++++
 libgitg/gitg-diff-view.vala                |    1 +
 2 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/libgitg/gitg-diff-view-commit-details.vala b/libgitg/gitg-diff-view-commit-details.vala
index 15d177d..209d78b 100644
--- a/libgitg/gitg-diff-view-commit-details.vala
+++ b/libgitg/gitg-diff-view-commit-details.vala
@@ -62,6 +62,12 @@ class Gitg.DiffViewCommitDetails : Gtk.Grid
                }
        }
 
+       public bool expander_visible
+       {
+               get { return d_expander_files.visible; }
+               set { d_expander_files.visible = value; }
+       }
+
        private Cancellable? d_avatar_cancel;
 
        private Ggit.Commit? d_commit;
diff --git a/libgitg/gitg-diff-view.vala b/libgitg/gitg-diff-view.vala
index 213aa75..1466c12 100644
--- a/libgitg/gitg-diff-view.vala
+++ b/libgitg/gitg-diff-view.vala
@@ -360,6 +360,7 @@ public class Gitg.DiffView : Gtk.Grid
                add_file();
 
                d_commit_details.expanded = (files.size <= 1);
+               d_commit_details.expander_visible = (files.size > 1);
 
                foreach (var file in files)
                {