ViperIDE with WebAssembly MP does not let you create directory at file creation dialog

[rkompass]

Describe the bug
ViperIDE with WebAssembly MP does not let you create directory at file creation dialog.
Pressing the + beneath a directory in the file manager panel and entering a name with / leads to an error:

 File "<stdin>", line 5, in <module>
OSError: 20

in a red box at the top right.
While simple file creation or deletion (using + or x) works!

Setup

• MicroPython board: WebAssembly, as in https://viper-ide.org/?emulator=1
• MicroPython version: 1.24.0-preview.47
• OS version: Linux
• Browser: Brave, Chromium, Firefox
• Connection type: none

To Reproduce
Steps to reproduce the behavior:

1. Open the above link in a new browser window.
2. Click in the file manager window the + besides the tmp directory and enter tmpdir/ for example.
3. See error

Expected behavior
Creation of the directory.

Actual Screenshots / Logs

Additional context
none

[vshymanskyy]

I reproduced it, working on a fix