[glade] GladeWidget: Write the hidden IDs out when previewing

[Tristan Van Berkom <tvb src gnome org>]

commit d6b334384a2598c9391d349d59756dd9468c7204
Author: Tristan Van Berkom <tristan vanberkom codethink co uk>
Date:   Fri Jan 29 15:10:00 2016 +0100

    GladeWidget: Write the hidden IDs out when previewing
    
    For the previewer, we need the name of the widget we're gonna
    preview, even if we dont serialize it in the real output

 gladeui/glade-widget.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gladeui/glade-widget.c b/gladeui/glade-widget.c
index 1969df5..e2b3874 100644
--- a/gladeui/glade-widget.c
+++ b/gladeui/glade-widget.c
@@ -4342,7 +4342,7 @@ glade_widget_write (GladeWidget     *widget,
 
       /* Conditionally omit the ID in the output if the name is 'unset'
        */
-      if (glade_widget_has_name (widget))
+      if (glade_widget_has_name (widget) || glade_project_writing_preview (widget->priv->project))
        glade_xml_node_set_property_string (widget_node,
                                            GLADE_XML_TAG_ID, widget->priv->name);
     }