Fixed SEARCH for UN/SEEN + UN/DELETED

lib/handlers/on-search.js

@@ -116,6 +116,16 @@ module.exports = server => (path, options, session, callback) => {
                             switch (term.value) {
                                 case '\\Seen':
                                 case '\\Deleted':
+                                    if (term.exists) {
+                                        parent.push({
+                                            ['un' + term.value.toLowerCase().substr(1)]: ne
+                                        });
+                                    } else {
+                                        parent.push({
+                                            ['un' + term.value.toLowerCase().substr(1)]: !ne
+                                        });
+                                    }
+                                    break;
                                 case '\\Flagged':
                                 case '\\Draft':
                                     if (term.exists) {