use correct index in answer array, fixes #165

views/exercises/rh_exercise/edit.php

@@ -28,13 +28,14 @@
                     </a>
                 </td>
                 <td class="dynamic_list">
-                    <? foreach ($exercise->task['answers'] as $j => $answer): ?>
+                    <? $j = 0 ?>
+                    <? foreach ($exercise->task['answers'] as $answer): ?>
                         <? if ($answer['group'] == $i): ?>
                             <? $size = substr_count($answer['text'], "\n") == 0 ? 'small' : 'large' ?>
 
                             <div class="dynamic_row size_toggle size_<?= $size ?>">
                                 <?= $this->render_partial('exercises/flexible_input', ['name' => "answer[$i][$j]", 'value' => $answer['text'], 'size' => $size]) ?>
-                                <input type="hidden" name="id[<?= $i ?>][<?= $j ?>]" value="<?= $answer['id'] ?>">
+                                <input type="hidden" name="id[<?= $i ?>][<?= $j++ ?>]" value="<?= $answer['id'] ?>">
 
                                 <a href="#" class="delete_dynamic_row">
                                     <?= Icon::create('trash', 'clickable', ['title' => _vips('Antwort Löschen')]) ?>