[gnome-builder] buffer: reset diagnostics on dispose

[Christian Hergert <chergert src gnome org>]

commit 93ae851a6e1dfe11c0eeacf4aaeca2af95f5a97b
Author: Christian Hergert <chergert redhat com>
Date:   Mon Jun 11 20:49:39 2018 -0700

    buffer: reset diagnostics on dispose
    
    Make sure we drop any state related to this immediately.

 src/libide/buffers/ide-buffer.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/libide/buffers/ide-buffer.c b/src/libide/buffers/ide-buffer.c
index 09d881b2d..3cc62c1b9 100644
--- a/src/libide/buffers/ide-buffer.c
+++ b/src/libide/buffers/ide-buffer.c
@@ -1486,6 +1486,8 @@ ide_buffer_dispose (GObject *object)
 
   g_assert (IDE_IS_MAIN_THREAD ());
 
+  ide_buffer_set_diagnostics (self, NULL);
+
   dzl_clear_source (&priv->settling_handler);
   dzl_clear_source (&priv->reclamation_handler);
   dzl_clear_source (&priv->check_modified_timeout);