[gitg] Do not add selections as mainlines for headers

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

commit 70bbc79c2911f516dcecca3fbf01845349e23d2b
Author: Jesse van den Kieboom <jessevdk gmail com>
Date:   Tue Dec 23 18:02:01 2014 +0100

    Do not add selections as mainlines for headers

 gitg/history/gitg-history-refs-list.vala |    5 +++++
 gitg/history/gitg-history.vala           |    3 ++-
 2 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/gitg/history/gitg-history-refs-list.vala b/gitg/history/gitg-history-refs-list.vala
index 25e2389..893bee6 100644
--- a/gitg/history/gitg-history-refs-list.vala
+++ b/gitg/history/gitg-history-refs-list.vala
@@ -790,6 +790,11 @@ public class RefsList : Gtk.ListBox
                }
        }
 
+       public bool is_header
+       {
+               get { return (get_selected_row() as RefHeader) != null; }
+       }
+
        public bool is_all
        {
                get
diff --git a/gitg/history/gitg-history.vala b/gitg/history/gitg-history.vala
index 1da862d..5324962 100644
--- a/gitg/history/gitg-history.vala
+++ b/gitg/history/gitg-history.vala
@@ -674,6 +674,7 @@ namespace GitgHistory
                                                                (Gee.EqualDataFunc)Ggit.OId.equal);
 
                        var isall = d_main.refs_list.is_all;
+                       var isheader = d_main.refs_list.is_header;
 
                        var perm_uniq = new Gee.HashSet<Ggit.OId>((Gee.HashDataFunc)Ggit.OId.hash,
                                                                  (Gee.EqualDataFunc)Ggit.OId.equal);
@@ -723,7 +724,7 @@ namespace GitgHistory
                                        {
                                                d_selected.add(id);
 
-                                               if (perm_uniq.add(id))
+                                               if (!isheader && perm_uniq.add(id))
                                                {
                                                        permanent += id;
                                                }