File node: Add fileWorkingDirectory to customise how relative paths are resolved

packages/node_modules/node-red/settings.js

@@ -46,6 +46,10 @@ module.exports = {
     //  defaults to 10Mb
     //execMaxBufferSize: 10000000,
 
+    // The working directory to handle relative file paths from within the File nodes
+    //  defaults to the working directory of the Node-RED process.
+    //fileWorkingDirectory: "",
+    
     // The maximum length, in characters, of any message sent to the debug sidebar tab
     debugMaxLength: 1000,