For some reason, Ren'Py refuses to set up vscode as editor on linux, even if it downloads it. In the meantime, i found this kind of fix.

vscode.edit.py

# For some reason, Ren'Py refuses to set up vscode as editor, even if it downloads it.
# In the meantime, i found this kind of fix.
# 1. Attempt to install  vscode for renpy.
# 2. if it fails and says "not specified", copypaste this in a new file
#    called "vscode.edit.py" inside the 'vscode' folder in renpy.
# 3. Change the CODE_PATH variable as indicated.
# 4. launch (or restart) renpy, and in the settings, choose the lone 'vscode' in the editor settings
# Many thanks to the chinese dude for this file.

import os
import subprocess
import renpy

# Change this with the absolute path of where renpy installs the vscode program.
# should be something like "r'/path/to/renpy/vscode/VSCode-linux-x64/code'"
CODE_PATH = r'/home/user/renpy-sdk/vscode/VSCode-linux-x64/code'


def code(argv):
    subprocess.Popen([CODE_PATH] + argv)


class Editor(renpy.editor.Editor):
    has_projects = True

    def begin(self, new_window=False, **kwargs):
        self.args = ['-n' if new_window else '-r']

    def end(self, **kwargs):
        self.args.reverse()
        code(self.args)

    def open(self, filename, line=None, **kwargs):
        filename = os.path.realpath(renpy.exports.fsencode(filename))
        if line:  
            self.args.append('%s:%d' % (filename, line))
            self.args.append('-g')
            
        else:
            self.args.append(filename)
            
        self.args.append(os.path.split(filename)[0] + '/')

    def open_project(self, directory):
        directory = os.path.realpath(renpy.exports.fsencode(directory))
        self.args.append('%s/' % directory)


def main():
    e = Editor()
    e.begin()

    for i in sys.argv[1:]:
        e.open(i)

    e.end()


if __name__ == "__main__":
    main()