Files dir gets appended an additional /files/ and breaks file storage (FileError {code: 5})

[mrodal]

Bug Report

Problem

I cant create files

What is expected to happen?

To be able to create files

What does actually happen?

I cant, I get FileError {code: 5}

Information

This line is the culprit:

cordova-plugin-file/src/android/FileUtils.java

Line 189 in c609ff6

persistentRoot = activity.getFilesDir().getAbsolutePath() + "/files/";

getFilesDir() already returns the path with /files, and its being added again for some reason.
This makes the rootUri of the persistent filesystem to reject every file in the /files/ directory in this line:

cordova-plugin-file/src/android/LocalFilesystem.java

Line 83 in c609ff6

if (!resolvedUri.getEncodedPath().startsWith(rootUriNoTrailingSlash)) {

Its also being returned here without the appended /files/

cordova-plugin-file/src/android/FileUtils.java

Line 993 in c609ff6

ret.put("dataDirectory", toDirUrl(context.getFilesDir()));

This is the filesystem on the device:

Which contradicts the documentation:

Command or Code

Environment, Platform, Device

Android Oreo

Version information

cordova-plugin-file 6.0.1

Checklist

• I searched for existing GitHub issues
• I updated all Cordova tooling to most recent version
• I included all the necessary information above