From 5e72fca15e3f01907ee5a9d548a725a043edf41c Mon Sep 17 00:00:00 2001
From: M66B <M66B@users.noreply.github.com>
Date: Sat, 8 Jan 2022 16:47:13 +0100
Subject: [PATCH] Common reference

---
 .../main/java/eu/faircode/email/MessageHelper.java | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/app/src/main/java/eu/faircode/email/MessageHelper.java b/app/src/main/java/eu/faircode/email/MessageHelper.java
index 0b75de8b80..f0b00140ab 100644
--- a/app/src/main/java/eu/faircode/email/MessageHelper.java
+++ b/app/src/main/java/eu/faircode/email/MessageHelper.java
@@ -1340,6 +1340,13 @@ public class MessageHelper {
                 }
         }
 
+        // Common reference
+        if (thread == null && refs.size() > 0) {
+            String ref = refs.get(0);
+            if (!Objects.equals(ref, msgid))
+                thread = ref;
+        }
+
         if (thread == null)
             thread = getHash() + ":" + uid;
 
@@ -1422,6 +1429,13 @@ public class MessageHelper {
                 }
         }
 
+        // Common reference
+        if (thread == null && refs.size() > 0) {
+            String ref = refs.get(0);
+            if (!Objects.equals(ref, msgid))
+                thread = ref;
+        }
+
         if (thread == null)
             thread = getHash() + ":" + uid;