Pivot thread changed slightly

- There is a reset button in the first arrow

- adding an event that exists already in the list should not create a new pivot point

app/Controller/EventsController.php

@@ -242,6 +242,9 @@ class EventsController extends AppController {
 
 	private function __continuePivoting($id, $info, $date){
 		$pivot = $this->Session->read('pivot_thread');
+		foreach ($pivot as $k => $v) {
+			if ($v[0] == $id) return;
+		}
 		$pivot[] = array($id, $info, $date);
 		$this->Session->write('pivot_thread', $pivot);
 	}

app/View/Events/view.ctp

@@ -139,18 +139,21 @@ $mayPublish = ($isAclPublish && $event['Event']['orgc'] == $me['org']);
 	<?php if (sizeOf($allPivots) > 1): ?>
 	<div>
 			<h3>Pivot Thread</h3>
+			<div class="arrow_box">
+				<?php 
+					echo $this->Html->link('Reset thread', array('controller' => 'events', 'action' => 'view', $event['Event']['id']));
+				?>
+			</div>
 			<?php 
 			foreach ($allPivots as $k => $v) {
-				?>
-				<div class="arrow_box">
+			?>
+			<div class="arrow_box">
 				<span title="<?php echo h($v[1]); ?>">
-				<?php  echo $this->Html->link(h($v[2]) . ' (' . h($v[0]) . ')', array('controller' => 'events', 'action' => 'view', $v[0], true, true));?>
+					<?php  echo $this->Html->link(h($v[2]) . ' (' . h($v[0]) . ')', array('controller' => 'events', 'action' => 'view', $v[0], true, true));?>
 				</span>
-
-				</div>
-				<?php 
-
-			}
+			</div>
+			<?php
+				}
 			?>
 	</div>
 	<?php endif; ?>