[gnome-builder] layout: clear page before unloading

[Christian Hergert <chergert src gnome org>]

commit e1e4e89b50ae6d5d0d10dfa565da624e0eb185ec
Author: Christian Hergert <chergert redhat com>
Date:   Tue Dec 11 21:03:01 2018 -0800

    layout: clear page before unloading
    
    This simplifies things for addins to only disconnect state in one place.

 src/libide/layout/ide-layout-stack.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/libide/layout/ide-layout-stack.c b/src/libide/layout/ide-layout-stack.c
index c2ab9dc21..93b770c35 100644
--- a/src/libide/layout/ide-layout-stack.c
+++ b/src/libide/layout/ide-layout-stack.c
@@ -438,6 +438,7 @@ ide_layout_stack_addin_removed (PeasExtensionSet *set,
   g_assert (plugin_info != NULL);
   g_assert (IDE_IS_LAYOUT_STACK_ADDIN (addin));
 
+  ide_layout_stack_addin_set_view (addin, NULL);
   ide_layout_stack_addin_unload (addin, self);
 }