Issue #2130277 by phenaproxima, michaellenahan, Jo Fitzgerald, David Hernández, hardik.p, fastangel, alvar0hurtad0: Variable to config: filter.settings [D7 only]

core/modules/filter/migration_templates/d7_filter_settings.yml

@@ -0,0 +1,13 @@
+id: d7_filter_settings
+label: Drupal 7 filter settings
+migration_tags:
+  - Drupal 7
+source:
+  plugin: variable
+  variables:
+    - filter_fallback_format
+process:
+  fallback_format: filter_fallback_format
+destination:
+  plugin: config
+  config_name: filter.settings

core/modules/filter/tests/src/Kernel/Migrate/d7/MigrateFilterSettingsTest.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace Drupal\Tests\filter\Kernel\Migrate\d7;
+
+use Drupal\Tests\migrate_drupal\Kernel\d7\MigrateDrupal7TestBase;
+
+/**
+ * Tests migration of Filter's settings to configuration.
+ *
+ * @group filter
+ */
+class MigrateFilterSettingsTest extends MigrateDrupal7TestBase {
+
+  public static $modules = ['filter'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+    $this->installConfig(static::$modules);
+    $this->executeMigration('d7_filter_settings');
+  }
+
+  /**
+   * Tests migration of Filter variables to configuration.
+   */
+  public function testFilterSettings() {
+    $this->assertSame('plain_text', $this->config('filter.settings')->get('fallback_format'));
+  }
+
+}

core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php

@@ -250,6 +250,10 @@ class MigrateUpgradeForm extends ConfirmFormBase {
       'source_module' => 'filter',
       'destination_module' => 'filter',
     ],
+    'd7_filter_settings' => [
+      'source_module' => 'filter',
+      'destination_module' => 'filter',
+    ],
     'd6_forum_settings' => [
       'source_module' => 'forum',
       'destination_module' => 'forum',