[gtk+] extract-strings: support GMenu GtkBuilder markup

[Ryan Lortie <desrt src gnome org>]

commit 3f1a413d0c673e4bbe9a1785b0cd3a0cbb015ad3
Author: Ryan Lortie <desrt desrt ca>
Date:   Wed Jan 15 01:35:43 2014 -0500

    extract-strings: support GMenu GtkBuilder markup
    
    Add support for extracting strings from GMenu markup in GtkBuilder
    files.
    
    This means that we have to support translatable <attribute/> tags.
    
    Unfortunately, <attribute> is also used by GtkTreeViewColumn and
    GtkLabel for other purposes, and those other purposes use a value=''
    (XML) attribute, so we must accept (and ignore) that in order not to
    have errors.  Nothing will happen in those cases because they do not
    also specify translatable='yes', so we ignore them.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=720552

 gtk/extract-strings.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gtk/extract-strings.c b/gtk/extract-strings.c
index df20d21..7592153 100644
--- a/gtk/extract-strings.c
+++ b/gtk/extract-strings.c
@@ -36,6 +36,7 @@ start_element_handler (GMarkupParseContext  *contexts,
   ParserData *data = user_data;
 
   if (g_str_equal (element_name, "property") ||
+      g_str_equal (element_name, "attribute") ||
       g_str_equal (element_name, "item"))
     {
       gboolean translatable;
@@ -47,6 +48,7 @@ start_element_handler (GMarkupParseContext  *contexts,
                                    attribute_values,
                                    error,
                                    G_MARKUP_COLLECT_STRING|G_MARKUP_COLLECT_OPTIONAL, "name", NULL,
+                                   G_MARKUP_COLLECT_STRING|G_MARKUP_COLLECT_OPTIONAL, "value", NULL,
                                    G_MARKUP_COLLECT_TRISTATE, "translatable", &translatable,
                                    G_MARKUP_COLLECT_STRDUP|G_MARKUP_COLLECT_OPTIONAL, "context", &context,
                                    G_MARKUP_COLLECT_STRDUP|G_MARKUP_COLLECT_OPTIONAL, "comments", &comments,