bug #916 check for AbstractBundle (tacman)

This PR was squashed before being merged into the 1.x branch.

Discussion
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check for AbstractBundle

Commits
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0e363a5 check for AbstractBundle

Author: nicolas-grekas

src/SymfonyBundle.php

@@ -107,6 +107,9 @@ private function isBundleClass(string $class, string $path, bool $isPsr4): bool
         }
 
         // heuristic that should work in almost all cases
-        return false !== strpos(file_get_contents($classPath), 'Symfony\Component\HttpKernel\Bundle\Bundle');
+        $classContents = file_get_contents($classPath);
+
+        return (false !== strpos($classContents, 'Symfony\Component\HttpKernel\Bundle\Bundle'))
+            || (false !== strpos($classContents, 'Symfony\Component\HttpKernel\Bundle\AbstractBundle'));
     }
 }