Implement draft previews and constraint analysis

amanuensis/resources/editor.js

@@ -110,7 +110,9 @@
     function submitArticle()
     {
         ifNoFurtherChanges(() => {
-            article.state = ArticleState.SUBMITTED;
+            article.state = (article.state == ArticleState.DRAFT
+                ? ArticleState.SUBMITTED
+                : ArticleState.DRAFT);
             update();
         },
         /* timeout: */ 0);