actualize rootRelativePath too

Author: anru

src/file-system-loader.js

@@ -42,6 +42,8 @@ export default class FileSystemLoader {
       if (newPath[0] !== '.' && newPath[0] !== '/') {
         try {
           fileRelativePath = nodeResolve.sync(newPath, { basedir: rootRelativeDir });
+          // in this case we need to actualize rootRelativePath too
+          rootRelativePath = fileRelativePath;
         }
         catch (e) {}
       }