diff -rupN a/core/modules/views/src/Form/ViewsExposedForm.php b/core/modules/views/src/Form/ViewsExposedForm.php
--- a/core/modules/views/src/Form/ViewsExposedForm.php	2019-01-17 01:30:03.000000000 +0200
+++ b/core/modules/views/src/Form/ViewsExposedForm.php	2019-02-08 17:12:28.000000000 +0200
@@ -67,8 +67,9 @@ class ViewsExposedForm extends FormBase
     $view = $form_state->get('view');
     $display = &$form_state->get('display');

-    $form_state->setUserInput($view->getExposedInput());
-
+    if (!$form_state->getUserInput()) {
+      $form_state->setUserInput($view->getExposedInput());
+    }
     // Let form plugins know this is for exposed widgets.
     $form_state->set('exposed', TRUE);
     // Check if the form was already created