This issue blocks. See for instructions.
There are three remaining calls to
theme() in Views plugins:
./core/modules/views/lib/Drupal/views/Plugin/views/field/FieldPluginBase.php: return theme($this->themeFunctions(), ./core/modules/views/lib/Drupal/views/Plugin/views/row/RssFields.php: return theme($this->themeFunctions(), ./core/modules/views/lib/Drupal/views/Plugin/views/style/Rss.php: $output = theme($this->themeFunctions(),
Review these and see if they can be refactored to not call
Git blame these lines to see how and when
theme() was reintroduced, then create a patch to convert them. See for previous conversions in Views.