Copying a File: Charset is not copied with the file

This bug can lead to data corruption.

### Steps to reproduce

1) create a file in a project
2) Set it's Charset to any Charset
3) Copy the file
4) Paste the file to any new location
5) See the charset of the new file being an "implicit" charset, stemming from one of it's parents

### Expected behaviour

I expect the charset to be copied together with the file.