Fix #857, clear message counter when the current user has replied in the history or when a Carbon message from the user was received

app/Message.php

@@ -93,6 +93,16 @@ class Message extends Model
         ]);
     }
 
+    public function clearUnreads()
+    {
+        if ($this->jidfrom == $this->user_id) {
+            $this->user->messages()
+                       ->where('jidfrom', $this->jidto)
+                       ->where('seen', false)
+                       ->update(['seen' => true]);
+        }
+    }
+
     public function set($stanza, $parent = false)
     {
         $this->id = ($stanza->{'stanza-id'} && $stanza->{'stanza-id'}->attributes()->id)

lib/moxl/src/Moxl/Xec/Payload/Carbons.php

@@ -18,6 +18,8 @@ class Carbons extends Payload
 
                 if (!$m->isOTR()) {
                     $m->save();
+                    $m->clearUnreads();
+
                     $this->pack($m);
                     $this->deliver();
                 }

lib/moxl/src/Moxl/Xec/Payload/MAMResult.php

@@ -28,6 +28,7 @@ class MAMResult extends Payload
             if (!$message->isOTR()
             && (!$message->isEmpty() || $message->isSubject())) {
                 $message->save();
+                $message->clearUnreads();
 
                 $this->pack($message);
                 $this->deliver();