also consider enclosure for fingerprint

db/item.php

@@ -221,7 +221,8 @@ class Item extends Entity implements IAPI, \JsonSerializable {
     }
 
     private function computeFingerprint() {
-        return md5($this->getTitle() . $this->getUrl() . $this->getBody());
+        return md5($this->getTitle() . $this->getUrl() . $this->getBody() .
+                   $this->getEnclosureLink());
     }
 
     public function setUrl($url) {

tests/unit/db/ItemTest.php

@@ -293,13 +293,17 @@ class ItemTest extends \PHPUnit_Framework_TestCase {
         $title = 'a';
         $body = 'b';
         $url = 'http://google.com';
+        $link = 'ho';
+
         $item = new Item();
         $item->setBody($body);
         $item->setTitle($title);
         $item->setUrl($url);
+        $item->setEnclosureLink($link);
         $item->generateSearchIndex();
 
-        $this->assertEquals(md5($title . $url . $body), $item->getFingerprint());
+        $this->assertEquals(md5($title . $url . $body . $link),
+                            $item->getFingerprint());
     }
 
 }

tests/unit/fetcher/FeedFetcherTest.php

@@ -222,7 +222,6 @@ class FeedFetcherTest extends \PHPUnit_Framework_TestCase {
         $item->setGuidHash($this->guid);
         $item->setBody($this->body);
         $item->setLastModified($this->time);
-        $item->generateSearchIndex();
         $item->setRtl(false);
 
         $this->expectItem('getAuthor', $this->author);
@@ -235,6 +234,8 @@ class FeedFetcherTest extends \PHPUnit_Framework_TestCase {
             $item->setEnclosureMime($enclosureType);
             $item->setEnclosureLink($this->enclosureLink);
         }
+        $item->generateSearchIndex();
+        
         return $item;
     }