[sysprof] callgraph-view: collapse row with Left Arrow

[Christian Hergert <chergert src gnome org>]

commit 69338ee16e11fde06cfe646e4d43e9f06af0cbc4
Author: Christian Hergert <chergert redhat com>
Date:   Tue Aug 30 13:01:16 2016 -0700

    callgraph-view: collapse row with Left Arrow
    
    This makes Left Arrow do the opposite of Right Arrow.

 lib/sp-callgraph-view.c |   15 ++++++++++++---
 1 files changed, 12 insertions(+), 3 deletions(-)
---
diff --git a/lib/sp-callgraph-view.c b/lib/sp-callgraph-view.c
index 2260d0b..57ea35c 100644
--- a/lib/sp-callgraph-view.c
+++ b/lib/sp-callgraph-view.c
@@ -671,13 +671,22 @@ descendants_view_move_cursor_cb (GtkTreeView     *descendants_view,
                                  int              direction,
                                  gpointer         user_data)
 {
-  if (step == GTK_MOVEMENT_VISUAL_POSITIONS && direction == 1)
+  if (step == GTK_MOVEMENT_VISUAL_POSITIONS)
     {
       GtkTreePath *path;
+
       gtk_tree_view_get_cursor (descendants_view, &path, NULL);
-      gtk_tree_view_expand_row (descendants_view, path, FALSE);
 
-      g_signal_stop_emission_by_name (descendants_view, "move-cursor");
+      if (direction == 1)
+        {
+          gtk_tree_view_expand_row (descendants_view, path, FALSE);
+          g_signal_stop_emission_by_name (descendants_view, "move-cursor");
+        }
+      else if (direction == -1)
+        {
+          gtk_tree_view_collapse_row (descendants_view, path);
+          g_signal_stop_emission_by_name (descendants_view, "move-cursor");
+        }
 
       gtk_tree_path_free (path);
     }