Issue #3029061 by tim.plunkett, xjm, phenaproxima, alexpott, tacituseu: New layouts are missing config schema

core/modules/layout_builder/config/schema/layout_builder.schema.yml

@@ -64,3 +64,16 @@ inline_block:
 
 block.settings.inline_block:*:
   type: inline_block
+
+layout_builder_multi_width:
+  type: layout_plugin.settings
+  mapping:
+    column_widths:
+      type: string
+      label: 'Column widths'
+
+layout_plugin.settings.layout_twocol_section:
+  type: layout_builder_multi_width
+
+layout_plugin.settings.layout_threecol_section:
+  type: layout_builder_multi_width

core/modules/layout_builder/tests/modules/layout_builder_defaults_test/config/install/core.entity_view_display.entity_test.bundle_with_extra_fields.default.yml

@@ -0,0 +1,36 @@
+langcode: en
+status: true
+dependencies:
+  module:
+    - layout_builder
+third_party_settings:
+  layout_builder:
+    sections:
+      -
+        layout_id: layout_twocol_section
+        layout_settings:
+          column_widths: '50-50'
+        components:
+          1445597a-c674-431d-ac0a-277d99347a7f:
+            uuid: 1445597a-c674-431d-ac0a-277d99347a7f
+            region: first
+            configuration:
+              label_display: '0'
+              context_mapping:
+                entity: layout_builder.entity
+              id: 'extra_field_block:entity_test:bundle_with_extra_fields:display_extra_field'
+            additional: {  }
+            weight: 1
+    allow_custom: false
+    enabled: true
+id: entity_test.bundle_with_extra_fields.default
+targetEntityType: entity_test
+bundle: bundle_with_extra_fields
+mode: default
+content:
+  display_extra_field:
+    weight: 100
+    settings: {  }
+    third_party_settings: {  }
+    region: content
+hidden: {  }

core/modules/layout_builder/tests/modules/layout_builder_defaults_test/layout_builder_defaults_test.info.yml

@@ -0,0 +1,6 @@
+name: 'Layout Builder defaults test'
+type: module
+description: 'Support module for testing layout building defaults.'
+package: Testing
+version: VERSION
+core: 8.x

core/modules/layout_builder/tests/src/Kernel/DefaultsSectionStorageTest.php

@@ -25,6 +25,7 @@ class DefaultsSectionStorageTest extends KernelTestBase {
   protected static $modules = [
     'layout_discovery',
     'layout_builder',
+    'layout_builder_defaults_test',
     'entity_test',
     'field',
     'system',
@@ -44,13 +45,27 @@ class DefaultsSectionStorageTest extends KernelTestBase {
   protected function setUp() {
     parent::setUp();
 
+    entity_test_create_bundle('bundle_with_extra_fields');
     $this->installSchema('system', ['key_value_expire']);
     $this->installEntitySchema('entity_test');
     $this->installEntitySchema('user');
+    $this->installConfig(['layout_builder_defaults_test']);
 
     $this->plugin = DefaultsSectionStorage::create($this->container, [], 'defaults', new SectionStorageDefinition());
   }
 
+  /**
+   * Tests installing defaults via config install.
+   */
+  public function testConfigInstall() {
+    /** @var \Drupal\layout_builder\Entity\LayoutEntityDisplayInterface $display */
+    $display = LayoutBuilderEntityViewDisplay::load('entity_test.bundle_with_extra_fields.default');
+    $section = $display->getSection(0);
+    $this->assertInstanceOf(Section::class, $section);
+    $this->assertEquals('layout_twocol_section', $section->getLayoutId());
+    $this->assertEquals(['column_widths' => '50-50'], $section->getLayoutSettings());
+  }
+
   /**
    * @covers ::access
    * @dataProvider providerTestAccess