[gnome-builder] beautifier plugin: fix view cleanup

[Sébastien Lafargue <slafargue src gnome org>]

commit 1756acee3c6f2e707a092b2ecbae4db1339919d9
Author: Sebastien Lafargue <slafargue gnome org>
Date:   Fri Jan 5 19:22:06 2018 +0100

    beautifier plugin: fix view cleanup

 .../beautifier/gb-beautifier-editor-addin.c        |   11 +++++++----
 1 files changed, 7 insertions(+), 4 deletions(-)
---
diff --git a/src/plugins/beautifier/gb-beautifier-editor-addin.c 
b/src/plugins/beautifier/gb-beautifier-editor-addin.c
index e593fe1..9dd5bad 100644
--- a/src/plugins/beautifier/gb-beautifier-editor-addin.c
+++ b/src/plugins/beautifier/gb-beautifier-editor-addin.c
@@ -414,13 +414,16 @@ gb_beautifier_editor_addin_view_set (IdeEditorAddin *addin,
       if (view == self->current_view)
         return;
 
-      if (view != NULL)
-        cleanup_view_cb (GTK_WIDGET (view), self);
+      cleanup_view_cb (GTK_WIDGET (self->current_view), self);
     }
 
-  self->current_view = view;
   if (view != NULL)
-    setup_view_cb (GTK_WIDGET (view), self);
+    {
+      dzl_set_weak_pointer (&self->current_view, view);
+      setup_view_cb (GTK_WIDGET (view), self);
+    }
+  else
+    self->current_view = NULL;
 }
 
 static void