From 5ee1c034108849d1409008fdbd166ab63adb73ae Mon Sep 17 00:00:00 2001
From: Eric Lapouyade <elapouya@gmail.com>
Date: Mon, 11 May 2020 17:55:53 +0200
Subject: [PATCH] fix get_undeclared_template_variables() to include
 header/footer

---
 docxtpl/__init__.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/docxtpl/__init__.py b/docxtpl/__init__.py
index d202e8f..72755ce 100644
--- a/docxtpl/__init__.py
+++ b/docxtpl/__init__.py
@@ -609,6 +609,9 @@ class DocxTemplate(object):
     def get_undeclared_template_variables(self, jinja_env=None):
         xml = self.get_xml()
         xml = self.patch_xml(xml)
+        for uri in [self.HEADER_URI, self.FOOTER_URI]:
+            for relKey, _xml in self.get_headers_footers_xml(uri):
+                xml += self.patch_xml(_xml)
         if jinja_env:
             env = jinja_env
         else: