- Patch #1330554 by oriol_e9g, fiftyz, richthegeek: Fixed taxonomy_get_tree() incorrect depth on multiple parents.

core/modules/taxonomy/taxonomy.module

@@ -1048,9 +1048,9 @@ function taxonomy_get_tree($vid, $parent = 0, $max_depth = NULL, $load_entities
           break;
         }
         $term = $load_entities ? $term_entities[$child] : $terms[$vid][$child];
-        if (count($parents[$vid][$term->tid]) > 1) {
+        if (isset($parents[$vid][$term->tid])) {
-          // We have a term with multi parents here. Clone the term,
+          // Clone the term so that the depth attribute remains correct
-          // so that the depth attribute remains correct.
+          // in the event of multiple parents.
           $term = clone $term;
         }
         $term->depth = $depth;

core/modules/taxonomy/taxonomy.test

@@ -416,6 +416,60 @@ class TaxonomyTermUnitTest extends TaxonomyWebTestCase {
     // Delete an invalid term. Should not throw any notices.
     taxonomy_term_delete(42);
   }
+
+  /**
+   * Test a taxonomy with terms that have multiple parents of different depths.
+   */
+  function testTaxonomyVocabularyTree() {
+    // Create a new vocabulary with 6 terms.
+    $vocabulary = $this->createVocabulary();
+    $term = array();
+    for ($i = 0; $i < 6; $i++) {
+      $term[$i] = $this->createTerm($vocabulary);
+    }
+
+    // $term[2] is a child of 1 and 5.
+    $term[2]->parent = array($term[1]->tid, $term[5]->tid);
+    taxonomy_term_save($term[2]);
+    // $term[3] is a child of 2.
+    $term[3]->parent = array($term[2]->tid);
+    taxonomy_term_save($term[3]);
+    // $term[5] is a child of 4.
+    $term[5]->parent = array($term[4]->tid);
+    taxonomy_term_save($term[5]);
+
+    /**
+     * Expected tree:
+     * term[0] | depth: 0
+     * term[1] | depth: 0
+     * -- term[2] | depth: 1
+     * ---- term[3] | depth: 2
+     * term[4] | depth: 0
+     * -- term[5] | depth: 1
+     * ---- term[2] | depth: 2
+     * ------ term[3] | depth: 3
+     */
+
+    // Count $term[1] parents with $max_depth = 1.
+    $tree = taxonomy_get_tree($vocabulary->vid, $term[1]->tid, 1);
+    $this->assertEqual(1, count($tree), 'We have one parent with depth 1.');
+
+    // Count all vocabulary tree elements.
+    $tree = taxonomy_get_tree($vocabulary->vid);
+    $this->assertEqual(8, count($tree), 'We have all vocabulary tree elements.');
+
+    // Count elements in every tree depth.
+    foreach($tree as $element) {
+      if (!isset($depth_count[$element->depth])) {
+        $depth_count[$element->depth] = 0;
+      }
+      $depth_count[$element->depth]++;
+    }
+    $this->assertEqual(3, $depth_count[0], 'Three elements in taxonomy tree depth 0.');
+    $this->assertEqual(2, $depth_count[1], 'Two elements in taxonomy tree depth 1.');
+    $this->assertEqual(2, $depth_count[2], 'Two elements in taxonomy tree depth 2.');
+    $this->assertEqual(1, $depth_count[3], 'One element in taxonomy tree depth 3.');
+   }
 }
 
 /**