perf[Tinymce]: set nonbreaking_force_tab to true

Author: PanJiaChen

src/components/Tinymce/index.vue

@@ -84,6 +84,7 @@ export default {
         imagetools_cors_hosts: ['www.tinymce.com', 'codepen.io'],
         default_link_target: '_blank',
         link_title: false,
+        nonbreaking_force_tab: true, // inserting nonbreaking space   need Nonbreaking Space Plugin
         init_instance_callback: editor => {
           if (_this.value) {
             editor.setContent(_this.value)