tinyMCE configuration for Contao 4.x - solve [nsbp] problem and set "paste as plain text" as default

be_tinyMCE.html5

<?php

namespace Contao;

if ($GLOBALS['TL_CONFIG']['useRTE']):

?>
<script>window.tinymce || document.write('<script src="<?= $this->asset('js/tinymce.min.js', 'contao-components/tinymce4') ?>">\x3C/script>')</script>
<script>
setTimeout(function() {
  window.tinymce && tinymce.init({
    skin: 'contao',
    selector: '#<?= $this->selector ?>',
    language: '<?= Backend::getTinyMceLanguage() ?>',
    element_format: 'html',
    document_base_url: '<?= Environment::get('base') ?>',
    entities: '160,nbsp,60,lt,62,gt,173,shy',
    branding: false,
    setup: function(editor) {
      editor.getElement().removeAttribute('required');
    },
    init_instance_callback: function(editor) {
      if (document.activeElement && document.activeElement.id && document.activeElement.id == editor.id) {
        editor.editorManager.get(editor.id).focus();
      }
      editor.on('focus', function() { Backend.getScrollOffset(); });
    },
    file_browser_callback: function(field_name, url, type, win) {
      Backend.openModalBrowser(field_name, url, type, win, '<?= $this->source ?>');
    },
    file_browser_callback_types: <?= json_encode($this->fileBrowserTypes) ?>,
    content_css: 'system/themes/<?= Backend::getTheme() ?>/tinymce.css',
    plugins: 'autosave charmap code fullscreen image importcss link lists paste searchreplace stripnbsp tabfocus table visualblocks visualchars',
    browser_spellcheck: true,
    tabfocus_elements: ':prev,:next',
    importcss_append: true,
    extended_valid_elements: 'q[cite|class|title],article,section,hgroup,figure,figcaption',
    menubar: 'edit insert view format table',
    toolbar: 'link unlink | image | formatselect | bold italic | alignleft aligncenter alignright alignjustify | bullist numlist outdent indent | code',
    entity_encoding: 'raw',
    paste_as_text: true
  });
}, 0);
</script>
<?php endif; ?>