[gnome-builder] sourceview: release completion on dispose

[Christian Hergert <chergert src gnome org>]

commit 9355bdc65d0bb2c9a9bd343dbe62e46499695b35
Author: Christian Hergert <chergert redhat com>
Date:   Thu Jun 14 04:39:16 2018 -0700

    sourceview: release completion on dispose

 src/libide/sourceview/ide-source-view.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/libide/sourceview/ide-source-view.c b/src/libide/sourceview/ide-source-view.c
index fc186a008..452f8d570 100644
--- a/src/libide/sourceview/ide-source-view.c
+++ b/src/libide/sourceview/ide-source-view.c
@@ -5355,6 +5355,7 @@ ide_source_view_dispose (GObject *object)
       priv->delay_size_allocate_chainup = 0;
     }
 
+  g_clear_object (&priv->completion);
   g_clear_object (&priv->capture);
   g_clear_object (&priv->indenter_adapter);
   g_clear_object (&priv->css_provider);