[gnome-builder] buffer: avoid rehighlight when disposing

[Christian Hergert <chergert src gnome org>]

commit b39f2b524db61831bcbee4b4af9248691d672c8b
Author: Christian Hergert <chergert redhat com>
Date:   Tue Jun 21 19:58:21 2016 -0700

    buffer: avoid rehighlight when disposing

 libide/buffers/ide-buffer.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)
---
diff --git a/libide/buffers/ide-buffer.c b/libide/buffers/ide-buffer.c
index 7d57aaa..a36dd10 100644
--- a/libide/buffers/ide-buffer.c
+++ b/libide/buffers/ide-buffer.c
@@ -561,7 +561,7 @@ ide_buffer__diagnostician_diagnose_cb (GObject      *object,
   if (!priv->has_done_diagnostics_once)
     {
       priv->has_done_diagnostics_once = TRUE;
-      ide_highlight_engine_rebuild (priv->highlight_engine);
+      ide_buffer_rehighlight (self);
     }
 }
 
@@ -2381,6 +2381,10 @@ ide_buffer_rehighlight (IdeBuffer *self)
 
   g_return_if_fail (IDE_IS_BUFFER (self));
 
+  /* In case we are disposing */
+  if (priv->highlight_engine == NULL)
+    return;
+
   if (gtk_source_buffer_get_highlight_syntax (GTK_SOURCE_BUFFER (self)))
     {
       ide_highlight_engine_rebuild (priv->highlight_engine);