Limit thread info parameters

app/src/main/java/eu/faircode/email/MessageHelper.java

@@ -1440,6 +1440,7 @@ public class MessageHelper {
         String msgid = getMessageID();
 
         List<String> refs = new ArrayList<>();
+
         for (String ref : getReferences())
             if (!TextUtils.isEmpty(ref) && !refs.contains(ref))
                 refs.add(ref);
@@ -1551,14 +1552,20 @@ public class MessageHelper {
         String msgid = getMessageID();
 
         List<String> refs = new ArrayList<>();
-        for (String ref : getReferences())
-            if (!TextUtils.isEmpty(ref) && !refs.contains(ref))
-                refs.add(ref);
 
         String inreplyto = getInReplyTo();
         if (!TextUtils.isEmpty(inreplyto) && !refs.contains(inreplyto))
             refs.add(inreplyto);
 
+        // The "References:" field will contain the contents of the parent's "References:" field (if any)
+        // followed by the contents of the parent's "Message-ID:" field (if any).
+        String[] r = getReferences();
+        for (int i = r.length - 1; i >= 0; i--) {
+            String ref = r[i];
+            if (!TextUtils.isEmpty(ref) && !refs.contains(ref))
+                refs.add(ref);
+        }
+
         boolean forward_new = prefs.getBoolean("forward_new", true);
         if (!forward_new)
             try {
@@ -1571,9 +1578,14 @@ public class MessageHelper {
 
         DB db = DB.getInstance(context);
 
-        List<String> all = new ArrayList<>(refs);
+        List<String> all = new ArrayList<>();
         if (!TextUtils.isEmpty(msgid))
             all.add(msgid);
+        all.addAll(refs);
+
+        // https://www.sqlite.org/limits.html
+        if (all.size() > 450)
+            all = all.subList(0, 450);
 
         int thread_range = prefs.getInt("thread_range", MessageHelper.DEFAULT_THREAD_RANGE);
         int range = (int) Math.pow(2, thread_range);