Issue #1998330 by clemens.tolboom, dawehner: Fixed Minipager is broken on page size == 1 due to ceil(PHP_MAX_INT / 1).

core/modules/views/lib/Drupal/views/Plugin/views/pager/Mini.php

@@ -82,8 +82,9 @@ class Mini extends SqlBase {
     if (count($result) > $this->get_items_per_page()) {
       array_pop($result);
       // Make sure the pager shows the next link by setting the total items to
-      // the biggest possible number.
+      // the biggest possible number but prevent failing calculations like
-      pager_default_initialize(PHP_INT_MAX, $this->get_items_per_page(), $this->options['id']);
+      // ceil(PHP_INT_MAX) we take PHP_INT_MAX / 2.
+      pager_default_initialize(PHP_INT_MAX / 2, $this->get_items_per_page(), $this->options['id']);
     }
   }
 

core/modules/views/lib/Drupal/views/Tests/Plugin/MiniPagerTest.php

@@ -73,6 +73,24 @@ class MiniPagerTest extends PluginTestBase {
     $this->assertText($this->nodes[18]->label());
     $this->assertText($this->nodes[19]->label());
 
+    // Test a mini pager with just one item per page.
+    $this->drupalGet('test_mini_pager_one');
+    $this->assertText('››');
+    $this->assertText('Page 1');
+    $this->assertText($this->nodes[0]->label());
+
+    $this->drupalGet('test_mini_pager_one', array('query' => array('page' => 1)));
+    $this->assertText('‹‹');
+    $this->assertText('Page 2');
+    $this->assertText('››');
+    $this->assertText($this->nodes[1]->label());
+
+    $this->drupalGet('test_mini_pager_one', array('query' => array('page' => 19)));
+    $this->assertNoText('››');
+    $this->assertText('Page 20');
+    $this->assertText('‹‹');
+    $this->assertText($this->nodes[19]->label());
+
     // Remove all items beside 1, so there should be no links shown.
     for ($i = 0; $i < 19; $i++) {
       $this->nodes[$i]->delete();

core/modules/views/tests/views_test_config/test_views/views.view.test_mini_pager.yml

@@ -84,6 +84,19 @@ display:
     position: ''
     display_options:
       path: test_mini_pager
+  page_2:
+    display_plugin: page
+    id: page_2
+    display_title: Page
+    position: ''
+    display_options:
+      path: test_mini_pager_one
+      defaults:
+        pager: '0'
+      pager:
+        type: mini
+        options:
+          items_per_page: '1'
 base_field: nid
 status: '1'
 module: views