[gitg] Fix updating selection when crossing up

[Jesse van den Kieboom <jessevdk src gnome org>]

commit e05d6b67bf08e9422eb9545c7b4d8bb96d0daa70
Author: Jesse van den Kieboom <jessevdk gnome org>
Date:   Mon Dec 21 07:55:22 2015 +0100

    Fix updating selection when crossing up

 libgitg/gitg-diff-view-file-selectable.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libgitg/gitg-diff-view-file-selectable.vala b/libgitg/gitg-diff-view-file-selectable.vala
index b901be3..7ff1858 100644
--- a/libgitg/gitg-diff-view-file-selectable.vala
+++ b/libgitg/gitg-diff-view-file-selectable.vala
@@ -463,7 +463,7 @@ class Gitg.DiffViewFileSelectable : Object
                // Clear to original selection
                if (start.get_line() < end.get_line())
                {
-                       var next = cursor;
+                       var next = start.get_line() < cursor.get_line() ? cursor : start;
                        next.forward_line();
 
                        clear_original_selection(next, end, true);