Issue #2003252 by ThomasVI, jibran: Rename Views method show_value_form() to showValueForm().

core/modules/views/lib/Drupal/views/Plugin/views/filter/FilterPluginBase.php

@@ -219,7 +219,7 @@ public function buildOptionsForm(&$form, &$form_state) {
       // Add the subform from operator_form().
       $this->showOperatorForm($form, $form_state);
       // Add the subform from valueForm().
-      $this->show_value_form($form, $form_state);
+      $this->showValueForm($form, $form_state);
       $form['clear_markup_end'] = array(
         '#markup' => '</div>',
       );
@@ -311,7 +311,7 @@ public function operatorSubmit($form, &$form_state) { }
   /**
    * Shortcut to display the value form.
    */
-  function show_value_form(&$form, &$form_state) {
+  protected function showValueForm(&$form, &$form_state) {
     $this->valueForm($form, $form_state);
     if (empty($this->no_operator)) {
       $form['value']['#prefix'] = '<div class="views-group-box views-right-70">' . (isset($form['value']['#prefix']) ? $form['value']['#prefix'] : '');