Revert "Revert "Link to message thread""

This reverts commit 45b567562b.

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

@@ -66,12 +66,18 @@ public class ActivityMain extends ActivityBase implements FragmentManager.OnBack
                     if (path == null)
                         return null;
                     String[] parts = path.split("/");
-                    if (parts.length < 1)
+                    if (parts.length < 3)
                         return null;
-                    long id = Long.parseLong(parts[1]);
+
+                    long account = Long.parseLong(parts[1]);
+                    String msgid = parts[2];
 
                     DB db = DB.getInstance(context);
-                    return db.message().getMessage(id);
+                    List<EntityMessage> messages = db.message().getMessagesByMsgId(account, msgid);
+                    if (messages == null || messages.size() == 0)
+                        return null;
+
+                    return messages.get(0);
                 }
 
                 @Override

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

@@ -4825,13 +4825,11 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                     if (!TextUtils.isEmpty(message.subject))
                         result.put("subject", message.subject);
 
-                    String link = "message://" + BuildConfig.APPLICATION_ID + "/" + message.id;
-
                     Document document = JsoupEx.parse(file);
 
                     Element a = document.createElement("a");
                     a.text(context.getString(R.string.app_name));
-                    a.attr("href", link);
+                    a.attr("href", message.getLink());
 
                     document.body().appendElement("p").appendChild(a);
 

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

@@ -24,6 +24,7 @@ import android.app.PendingIntent;
 import android.content.Context;
 import android.content.Intent;
 import android.content.SharedPreferences;
+import android.net.Uri;
 import android.text.TextUtils;
 
 import androidx.annotation.NonNull;
@@ -239,6 +240,10 @@ public class EntityMessage implements Serializable {
         return "<" + UUID.randomUUID() + "@" + domain + '>';
     }
 
+    String getLink() {
+        return "message://" + BuildConfig.APPLICATION_ID + "/" + this.account + "/" + Uri.encode(this.msgid);
+    }
+
     boolean replySelf(List<TupleIdentityEx> identities, long account) {
         Address[] senders = (reply == null || reply.length == 0 ? from : reply);
         if (identities != null && senders != null)