fix doubling of extension

package-lock.json

@@ -2820,9 +2820,9 @@
       "integrity": "sha512-PcW2a0tyTuPHz3tWyYqtK6r1fZ3gp+3Sop8Ph+ZYN81Ob5rwmbHEzaqs10N3BEsaGTkh/ooniXK+WwszGlc2+Q=="
     },
     "electron": {
-      "version": "6.0.0-beta.11",
-      "resolved": "https://registry.npmjs.org/electron/-/electron-6.0.0-beta.11.tgz",
-      "integrity": "sha512-B6zh9c5pJ0BKKNkOEbF6vKXnBCWgtvY8LaUYDNeR9ttnPP0CCm0oovIoqP9/nN5gL8rlCoCgKWsjmiHu0jg7mA==",
+      "version": "6.0.0-beta.13",
+      "resolved": "https://registry.npmjs.org/electron/-/electron-6.0.0-beta.13.tgz",
+      "integrity": "sha512-q1pX18l4N6PH0iCoHXPmgqDNEX2slvMYZcxWXHlUFQodtvXq7bnsFfr6uvifMT5oSdfsCZtXXPK3/iK6PdODNQ==",
       "dev": true,
       "requires": {
         "@types/node": "^10.12.18",

package.json

@@ -75,7 +75,7 @@
   },
   "devDependencies": {
     "devtron": "1.4.0",
-    "electron": "6.0.0-beta.11",
+    "electron": "6.0.0-beta.13",
     "electron-builder": "20.44.2",
     "electron-compile": "6.4.4",
     "electron-installer-debian": "2.0.0",

src/services/export/tar.js

@@ -62,7 +62,7 @@ async function exportToTar(exportContext, branch, format, res) {
         const existingExtension = path.extname(fileName).toLowerCase();
 
         // if the note is already named with extension (e.g. "jquery.js"), then it's silly to append exact same extension again
-        if (existingExtension !== extension) {
+        if (existingExtension !== "." + extension) {
             fileName += "." + extension;
         }