[gnome-builder] take full ref on enum class

[Christian Hergert <chergert src gnome org>]

commit 3dfdbedc10639132626f3f8f9e56f95d990e42fb
Author: Christian Hergert <christian hergert me>
Date:   Sat Mar 21 17:20:38 2015 -0700

    take full ref on enum class
    
    this can happen if the first thing you do is run a command from command
    bar.

 libide/ide-source-view-movements.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/libide/ide-source-view-movements.c b/libide/ide-source-view-movements.c
index 032d593..403d97b 100644
--- a/libide/ide-source-view-movements.c
+++ b/libide/ide-source-view-movements.c
@@ -1260,13 +1260,14 @@ _ide_source_view_apply_movement (IdeSourceView         *self,
     GEnumValue *enum_value;
     GEnumClass *enum_class;
 
-    enum_class = g_type_class_peek (IDE_TYPE_SOURCE_VIEW_MOVEMENT);
+    enum_class = g_type_class_ref (IDE_TYPE_SOURCE_VIEW_MOVEMENT);
     enum_value = g_enum_get_value (enum_class, movement);
     IDE_TRACE_MSG ("movement(%s, extend_selection=%s, exclusive=%s, count=%u)",
                    enum_value->value_nick,
                    extend_selection ? "YES" : "NO",
                    exclusive ? "YES" : "NO",
                    count);
+    g_type_class_unref (enum_class);
   }
 #endif