def _test():

from idlelib.editor import fixwordbreaks

from idlelib.run import fix_scaling

import sys

root = Tk()

fix_scaling(root)

fixwordbreaks(root)

root.withdraw()

flist = FileList(root)

if TkVersion < 8.5:

root = Tk() # otherwise create root in main

root.withdraw()

from idlelib.run import fix_scaling

fix_scaling(root)

tkMessageBox.showerror("Idle Cannot Start",

"Idle requires tcl/tk 8.5+, not %s." % TkVersion,

parent=root)

NoDefaultRoot()

root = Tk(className="Idle")

root.withdraw()

from idlelib.run import fix_scaling

fix_scaling(root)

# set application icon

icondir = os.path.join(os.path.dirname(__file__), 'Icons')

import tkinter

from tkinter.messagebox import showerror

root = tkinter.Tk()

fix_scaling(root)

root.withdraw()

msg = f"IDLE's subprocess can't connect to {address[0]}:{address[1]}.\n"\

f"Fatal OSError #{err.errno}: {err.strerror}.\n"\

sys.exit(0)

def fix_scaling(root):

"""Scale fonts on HiDPI displays."""

import tkinter.font

scaling = float(root.tk.call('tk', 'scaling'))

if scaling > 1.4:

for name in tkinter.font.names(root):

font = tkinter.font.Font(root=root, name=name, exists=True)

size = int(font['size'])

if size < 0:

font['size'] = round(-0.75*size)

class MyRPCServer(rpc.RPCServer):

def handle_error(self, request, client_address):

Default fonts now are scaled on HiDPI displays.