Can't change driver letter in windows

[will]

Hi.
It's seems can't change driver letter in windows.

Up button is disable when path is root of driver.

[will]

I think it is possible to add a judgment on whether it is Windows or not to this code, and if so, try to get all the driverr letters.Is right that?I wanted to make a PR, but I was afraid that my idea would be wrong

egui_file/src/lib.rs

Lines 567 to 578 in c97c202

 fn read_folder(path: &Path) -> Result<Vec<PathBuf>, Error> { 
   match fs::read_dir(path) { 
     Ok(paths) => { 
       let mut result: Vec<PathBuf> = paths 
         .filter_map(|result| result.ok()) 
         .map(|entry| entry.path()) 
         .collect(); 
       result.sort_by(|a, b| a.file_name().cmp(&b.file_name())); 
       Ok(result) 
     } 
     Err(e) => Err(e), 
   } 

[Barugon]

For now, I believe that you can change the drive letter in the path edit. I'll try out your idea in Wine when I get a bit of time.

[Barugon]

@willser, can you give the latest a try? It works for me under Wine but I just want to make sure.