Merge "Upstream `isElementInViewport` from MobileFrontend"

diff --combined resources/Resources.php
index 16f6c94,8b6b559..bdf95a7
--- 1/resources/Resources.php
--- 2/resources/Resources.php
+++ b/resources/Resources.php
@@@ -1191,7 -1191,6 +1191,7 @@@ return 
                        'oojs-ui-windows',
                        'oojs-ui.styles.icons-content',
                        'oojs-ui.styles.icons-editing-advanced',
 +                      'moment',
                        'mediawiki.Title',
                        'mediawiki.user',
                        'mediawiki.Upload',
@@@ -1335,6 -1334,11 +1335,11 @@@
                'position' => 'top', // For $wgPreloadJavaScriptMwUtil
                'targets' => [ 'desktop', 'mobile' ],
        ],
+       'mediawiki.viewport' => [
+               'scripts' => 'resources/src/mediawiki/mediawiki.viewport.js',
+               'position' => 'top',
+               'targets' => [ 'desktop', 'mobile' ],
+       ],
        'mediawiki.checkboxtoggle' => [
                'scripts' => 'resources/src/mediawiki/mediawiki.checkboxtoggle.js',
                'position' => 'top',
@@@ -1481,7 -1485,6 +1486,7 @@@
        ],
        'mediawiki.action.view.redirectPage' => [
                'position' => 'top',
 +              'targets' => [ 'desktop', 'mobile' ],
                'styles' => 'resources/src/mediawiki.action/mediawiki.action.view.redirectPage.css',
        ],
        'mediawiki.action.view.rightClickEdit' => [
@@@ -1684,7 -1687,6 +1689,7 @@@
                'position' => 'top',
                'scripts' => 'resources/src/mediawiki.special/mediawiki.special.js',
                'styles' => 'resources/src/mediawiki.special/mediawiki.special.css',
 +              'targets' => [ 'desktop', 'mobile' ],
        ],
        'mediawiki.special.apisandbox.styles' => [
                'styles' => 'resources/src/mediawiki.special/mediawiki.special.apisandbox.top.css',
@@@ -2213,25 -2215,6 +2218,25 @@@
                ],
                'targets' => [ 'desktop', 'mobile' ],
        ],
 +      'mediawiki.widgets.SearchInputWidget' => [
 +              'scripts' => [
 +                      'resources/src/mediawiki.widgets/mw.widgets.SearchInputWidget.js',
 +              ],
 +              'dependencies' => [
 +                      'mediawiki.searchSuggest',
 +                      // FIXME: Needs TitleInputWidget only
 +                      'mediawiki.widgets',
 +              ],
 +      ],
 +      'mediawiki.widgets.SearchInputWidget.styles' => [
 +              'skinStyles' => [
 +                      'default' => [
 +                              'resources/src/mediawiki.widgets/mw.widgets.SearchInputWidget.css',
 +                      ],
 +              ],
 +              'position' => 'top',
 +              'targets' => [ 'desktop', 'mobile' ],
 +      ],
  
        /* es5-shim */
        'es5-shim' => [