2c2
< index 45c2c66..1631746 100755
---
> index 45c2c66..0b7c3d3 100755
10c10
< +    $compare_revision_submit = array(
---
> +    $compare_revision_submit = [
14,15c14,15
< +      '#attributes' => array(
< +        'class' => array(
---
> +      '#attributes' => [
> +        'class' => [
17,19c17,19
< +        ),
< +      ),
< +    );
---
> +        ],
> +      ],
> +    ];
24c24
< +      $build['submit_top'][] = $compare_revision_submit;
---
> +      $build['submit_top'] = $compare_revision_submit;
44c44
< +      $build['submit_bottom'][] = $compare_revision_submit;
---
> +      $build['submit_bottom'] = $compare_revision_submit;
47a48,130
> diff --git a/tests/src/Functional/DiffRevisionTest.php b/tests/src/Functional/DiffRevisionTest.php
> index b961833..b89cae4 100644
> --- a/tests/src/Functional/DiffRevisionTest.php
> +++ b/tests/src/Functional/DiffRevisionTest.php
> @@ -77,6 +77,10 @@ class DiffRevisionTest extends DiffTestBase {
>      // Assert the revision summary.
>      $this->assertSession()->pageTextContainsOnce('Revision 2 comment');
>  
> +    // Assert the submit button.
> +    $this->assertSession()->elementExists('xpath','//input[@type="submit" and @id="edit-submit-bottom" and @value="Compare selected revisions"]');
> +    $this->assertSession()->elementNotExists('xpath','//input[@type="submit" and @id="edit-submit-top" and @value="Compare selected revisions"]');
> +
>      // Compare the revisions in standard mode.
>      $this->submitForm([], 'Compare selected revisions');
>      $this->clickLink('Split fields');
> @@ -207,7 +211,7 @@ class DiffRevisionTest extends DiffTestBase {
>      // Assert that there are no radio buttons for revision selection.
>      $this->assertSession()->elementNotExists('xpath','//input[@type="radio"]');
>      // Assert that there is no submit button.
> -    $this->assertSession()->elementNotExists('xpath','//input[@type="submit" and text()="Compare selected revisions"]');
> +    $this->assertSession()->elementNotExists('xpath','//input[@type="submit" and @value="Compare selected revisions"]');
>  
>      // Create two new revisions of node.
>      $edit = [
> @@ -285,6 +289,58 @@ class DiffRevisionTest extends DiffTestBase {
>      }
>    }
>  
> +  /**
> +   * Tests pager on diff overview.
> +   */
> +  public function testRevisionOverviewLong() {
> +    $this->drupalPlaceBlock('system_breadcrumb_block');
> +    // Login as admin with the required permission.
> +    $this->loginAsAdmin(['delete any article content']);
> +
> +    // Create an article.
> +    $title = 'test_title_a';
> +    $edit = array(
> +      'title[0][value]' => $title,
> +      'body[0][value]' => '<p>Revision 1</p>
> +      <p>first_unique_text</p>
> +      <p>second_unique_text</p>',
> +    );
> +    // Set to published if content moderation is enabled.
> +    if (\Drupal::moduleHandler()->moduleExists('content_moderation')) {
> +      $edit['moderation_state[0][state]'] = 'published';
> +    }
> +    $this->drupalPostNodeForm('node/add/article', $edit, t('Save and publish'));
> +    $node = $this->drupalGetNodeByTitle($title);
> +    $this->drupalGet('node/' . $node->id());
> +
> +    // Create a second revision, with a revision comment.
> +    for ($i = 2; $i <= 6; $i++) {
> +      $edit = [
> +        'body[0][value]' => '<p>Revision ' . $i . '</p>
> +        <p>first_unique_text</p>
> +        <p>second_unique_text</p>',
> +        'revision' => TRUE,
> +        'revision_log[0][value]' => 'Revision ' . $i . ' comment',
> +      ];
> +      // Set to published if content moderation is enabled.
> +      if (\Drupal::moduleHandler()->moduleExists('content_moderation')) {
> +        $edit['moderation_state[0][state]'] = 'published';
> +      }
> +      $this->drupalPostNodeForm('node/' . $node->id() . '/edit', $edit, t('Save and keep published'));
> +    }
> +    $this->drupalGet('node/' . $node->id());
> +
> +    // Check the revisions overview.
> +    $this->clickLink(t('Revisions'));
> +    $rows = $this->xpath('//tbody/tr');
> +    // Make sure only two revisions available.
> +    $this->assertCount(6, $rows);
> +
> +    // Assert the submit button.
> +    $this->assertSession()->elementExists('xpath','//input[@type="submit" and @id="edit-submit-top" and @value="Compare selected revisions"]');
> +    $this->assertSession()->elementExists('xpath','//input[@type="submit" and @id="edit-submit-bottom" and @value="Compare selected revisions"]');
> +  }
> +
>    /**
>     * Tests pager on diff overview.
>     */