Ticket #59354: 59354.diff

src/wp-includes/post.php

@@ -4997 +4997 @@
                 clean_post_cache( $post_id );
         }
 
-        if ( is_object_in_taxonomy( $post_type, 'category' ) ) {
+        if ( is_object_in_taxonomy( $post_type, 'category' ) && ( ! $update || isset( $postarr['post_category'] ) ) ) {
                 wp_set_post_categories( $post_id, $post_category );
         }
 

tests/phpunit/tests/post/wpInsertPost.php

@@ -1530 +1530 @@
 
                 $this->assertSame( 'future', get_post_status( $post_id ) );
         }
+
+        /**
+         * Verify that updating a post without taxonomy parameters avoids unnecessary queries.
+         *
+         * @ticket 59354
+         * @covers ::wp_insert_post
+         */
+        public function test_update_post_without_taxonomy_params_skips_term_queries() {
+                $post_id = self::factory()->post->create(
+                        array(
+                                'post_title'    => 'Test Post',
+                                'tags_input'    => array( 'tag1' ),
+                                'post_category' => array( 1 ),
+                        )
+                );
+
+                // Update with taxonomy params — baseline query count.
+                $queries_before = get_num_queries();
+                wp_insert_post(
+                        array(
+                                'ID'            => $post_id,
+                                'post_title'    => 'Updated With Taxes',
+                                'tags_input'    => array( 'tag1' ),
+                                'post_category' => array( 1 ),
+                        )
+                );
+                $queries_with_tax = get_num_queries() - $queries_before;
+
+                // Update without taxonomy params — should use fewer queries.
+                $queries_before = get_num_queries();
+                wp_insert_post(
+                        array(
+                                'ID'         => $post_id,
+                                'post_title' => 'Updated Without Taxes',
+                        )
+                );
+                $queries_without_tax = get_num_queries() - $queries_before;
+
+                $this->assertLessThan(
+                        $queries_with_tax,
+                        $queries_without_tax,
+                        'Updating a post without taxonomy parameters should use fewer queries.'
+                );
+        }
 }