From 86edf56482428c240dec7b0219510aeb649733c1 Mon Sep 17 00:00:00 2001
From: Witold Filipczyk <witekfl@poczta.onet.pl>
Date: Sat, 7 Aug 2021 20:50:36 +0200
Subject: [PATCH] [xml] Do not override headers if they did not change.

---
 src/document/xml/renderer2.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/document/xml/renderer2.c b/src/document/xml/renderer2.c
index 796c10de..5566b953 100644
--- a/src/document/xml/renderer2.c
+++ b/src/document/xml/renderer2.c
@@ -314,6 +314,8 @@ render_xhtml_document(struct cache_entry *cached, struct document *document, str
 		buffer = &tt;
 		document->text = tt.source;
 	}
-	mem_free_set(&cached->head, head.source);
+	if (add_to_head) {
+		mem_free_set(&cached->head, head.source);
+	}
 	render_html_document(cached, document, buffer);
 }