fix(host): Do not use meta header if the value has commas or colons

src/model/messaging.rs

@@ -1106,6 +1106,38 @@ pub mod tests {
         );
     }
 
+    #[test]
+    fn escaped_meta_headers_with_special_chars_test() {
+        let mut request = get_blank_compose();
+        request.configuration.allow_custom_headers = true;
+        request.configuration.meta_headers = true;
+        request.compose_details.custom_headers.push(CustomHeader {
+            name: "X-ExtEditorR-Foo".to_string(),
+            value: "bar, X-ExtEditorR: world, Priority: high".to_string(),
+        });
+        request.compose_details.custom_headers.push(CustomHeader {
+            name: "X-Foo".to_string(),
+            value: "bar, X-Hello: world".to_string(),
+        });
+
+        let output = to_eml_and_assert(&request);
+        let responses = {
+            let mut request = request.clone();
+            let mut output = output.as_bytes();
+            request.merge_from_eml(&mut output, 512).unwrap()
+        };
+
+        assert_eq!(1, responses.len());
+        assert_eq!(
+            request.compose_details.priority,
+            responses[0].compose_details.priority
+        );
+        assert_eq!(
+            request.compose_details.custom_headers,
+            responses[0].compose_details.custom_headers
+        );
+    }
+
     #[test]
     fn delete_send_on_exit_header_test() {
         let mut eml = "Subject: Hello\r\n\r\nThis is a test.\r\n".as_bytes();