Issue #1430300 by mradcliffe, effulgentsia: Fixed Preprocess functions in an...

Issue #1430300 by mradcliffe, effulgentsia: Fixed Preprocess functions in an include file fail to get called when the theme implements a suggestion override.

core/includes/theme.inc

@@ -1035,6 +1035,13 @@ function theme($hook, $variables = array()) {
   if (isset($info['base hook'])) {
     $base_hook = $info['base hook'];
     $base_hook_info = $hooks[$base_hook];
+    // Include files required by the base hook, since its variable processors
+    // might reside there.
+    if (!empty($base_hook_info['includes'])) {
+      foreach ($base_hook_info['includes'] as $include_file) {
+        include_once DRUPAL_ROOT . '/' . $include_file;
+      }
+    }
     if (isset($base_hook_info['preprocess functions']) || isset($base_hook_info['process functions'])) {
       $variables['theme_hook_suggestion'] = $hook;
       $hook = $base_hook;

core/modules/simpletest/tests/theme.test

@@ -52,11 +52,19 @@ class ThemeUnitTest extends DrupalWebTestCase {
   }
 
   /**
-  * Preprocess functions for the base hook should run even for suggestion implementations.
-  */
+   * Ensures preprocess functions run even for suggestion implementations.
+   *
+   * The theme hook used by this test has its base preprocess function in a
+   * separate file, so this test also ensures that that file is correctly loaded
+   * when needed.
+   */
   function testPreprocessForSuggestions() {
-    $this->drupalGet('theme-test/suggestion');
-    $this->assertText('test_theme_breadcrumb__suggestion: 1', t('Theme hook suggestion ran with data available from a preprocess function for the base hook.'));
+    // Test with both an unprimed and primed theme registry.
+    drupal_theme_rebuild();
+    for ($i = 0; $i < 2; $i++) {
+      $this->drupalGet('theme-test/suggestion');
+      $this->assertText('Theme hook implementor=test_theme_theme_test__suggestion(). Foo=template_preprocess_theme_test', 'Theme hook suggestion ran with data available from a preprocess function for the base hook.');
+    }
   }
 
   /**

core/modules/simpletest/tests/theme_test.inc

+<?php
+
+/**
+ * Returns HTML for the 'theme_test' theme hook used by tests.
+ */
+function theme_theme_test($variables) {
+  return 'Theme hook implementor=theme_theme_test(). Foo=' . $variables['foo'];
+}
+
+/**
+ * Preprocesses variables for theme_theme_test().
+ */
+function template_preprocess_theme_test(&$variables) {
+  $variables['foo'] = 'template_preprocess_theme_test';
+}

core/modules/simpletest/tests/theme_test.module

@@ -4,13 +4,16 @@
  * Implements hook_theme().
  */
 function theme_test_theme($existing, $type, $theme, $path) {
+  $items['theme_test'] = array(
+    'file' => 'theme_test.inc',
+    'variables' => array('foo' => ''),
+  );
   $items['theme_test_template_test'] = array(
     'template' => 'theme_test.template_test',
   );
   $items['theme_test_template_test_2'] = array(
     'template' => 'theme_test.template_test',
   );
-
   return $items;
 }
 
@@ -129,16 +132,7 @@ function _theme_test_alter() {
  * Page callback, calls a theme hook suggestion.
  */
 function _theme_test_suggestion() {
-  return theme(array('breadcrumb__suggestion', 'breadcrumb'), array());
-}
-
-/**
- * Implements hook_preprocess_breadcrumb().
- *
- * Set a variable that can later be tested to see if this function ran.
- */
-function theme_test_preprocess_breadcrumb(&$variables) {
-  $variables['theme_test_preprocess_breadcrumb'] = 1;
+  return theme(array('theme_test__suggestion', 'theme_test'), array());
 }
 
 /**

core/modules/simpletest/tests/themes/test_theme/template.php

@@ -3,10 +3,8 @@
 /**
  * Tests a theme overriding a suggestion of a base theme hook.
  */
-function test_theme_breadcrumb__suggestion($variables) {
-  // Tests that preprocess functions for the base theme hook get called even
-  // when the suggestion has an implementation.
-  return 'test_theme_breadcrumb__suggestion: ' . $variables['theme_test_preprocess_breadcrumb'];
+function test_theme_theme_test__suggestion($variables) {
+  return 'Theme hook implementor=test_theme_theme_test__suggestion(). Foo=' . $variables['foo'];
 }
 
 /**