Sorry for the delay; I lost the mail notification.
I don't have a config-main.cfg file.
The last output from the test, with the print added:
test_dialog (idlelib.idle_test.test_configdialog.ConfigDialogTest) ... ('.139655680391704', 'configure', '-borderwidth', 5)
('.139655680391704.139655680370912.139655680371640.139655680370184.139655676916736.139655676917048.139655676917672', 'configure', '-command', '139655677350312yview')
('.139655680391704.139655680370912.139655680371640.139655680370184.139655676916736.139655676917048.139655676917360', 'configure', '-yscrollcommand', '139655677341608set')
('.139655680391704.139655680370912.139655680371640.139655680370184.139655676916736.139655676917152.139655676918296', 'configure', '-menu', <tkinter.Menu object .139655680391704.139655680370912.139655680371640.139655680370184.139655676916736.139655676917152.139655676918296.menu>)
('.139655680391704.139655680370912.139655680371640.139655680370184.139655676916736.139655676917152.139655676918296', 'configure')
('.139655680391704.139655680370912.139655680371640.139655680345608.139655676932496.139655676932704', 'configure', '-state', 'disabled')
('.139655680391704.139655680370912.139655680371640.139655680345608.139655676932496.139655677333032.139655677332408', 'configure', '-menu', <tkinter.Menu object .139655680391704.139655680370912.139655680371640.139655680345608.139655676932496.139655677333032.139655677332408.menu>)
('.139655680391704.139655680370912.139655680371640.139655680345608.139655676932496.139655677333032.139655677332408', 'configure', '-highlightthickness', 0)
('.139655680391704.139655680370912.139655680371640.139655680345608.139655676932600.139655676935200', 'configure', '-menu', <tkinter.Menu object .139655680391704.139655680370912.139655680371640.139655680345608.139655676932600.139655676935200.menu>)
('.139655680391704.139655680370912.139655680371640.139655680345608.139655676932600.139655676935200', 'configure')
('.139655680391704.139655680370912.139655680371640.139655680345608.139655676932600.139655676935616', 'configure', '-menu', <tkinter.Menu object .139655680391704.139655680370912.139655680371640.139655680345608.139655676932600.139655676935616.menu>)
('.139655680391704.139655680370912.139655680371640.139655680345608.139655676932600.139655676935616', 'configure')
('.139655680391704.139655680370912.139655680371640.139655680789328.139655676961480.139655676961688.139655676961896', 'configure', '-command', '139655676968648yview')
('.139655680391704.139655680370912.139655680371640.139655680789328.139655676961480.139655676961688.139655676962000', 'configure', '-command', '139655676973368xview')
('.139655680391704.139655680370912.139655680371640.139655680789328.139655676961480.139655676961688.139655676962104', 'configure', '-yscrollcommand', '139655676973928set')
('.139655680391704.139655680370912.139655680371640.139655680789328.139655676961480.139655676961688.139655676962104', 'configure', '-xscrollcommand', '139655676974600set')
('.139655680391704.139655680370912.139655680371640.139655680789328.139655676961584.139655676963352.139655676963976', 'configure', '-menu', <tkinter.Menu object .139655680391704.139655680370912.139655680371640.139655680789328.139655676961584.139655676963352.139655676963976.menu>)
('.139655680391704.139655680370912.139655680371640.139655680789328.139655676961584.139655676963352.139655676963976', 'configure')
('.139655680391704.139655680370912.139655680371640.139655680789328.139655676961584.139655676963352.139655676964392', 'configure', '-menu', <tkinter.Menu object .139655680391704.139655680370912.139655680371640.139655680789328.139655676961584.139655676963352.139655676964392.menu>)
('.139655680391704.139655680370912.139655680371640.139655680789328.139655676961584.139655676963352.139655676964392', 'configure')
('.139655680391704.139655680370912.139655680371640.139655677346192.139655676990984.139655676992648.139655676992856', 'configure', '-command', '139655676998504yview')
('.139655680391704.139655680370912.139655680371640.139655677346192.139655676990984.139655676992648.139655676992960', 'configure', '-yscrollcommand', '139655677003496set')
('.139655680391704.139655680370912.139655680371640.139655680370184.139655676916736.139655676918920.139655676919024', 'configure', '-font', '{dejavu sans mono} {} normal')
ERROR
======================================================================
ERROR: test_dialog (idlelib.idle_test.test_configdialog.ConfigDialogTest)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/pviktori/dev/cpython/Lib/idlelib/idle_test/test_configdialog.py", line 27, in test_dialog
d=ConfigDialog(self.root, 'Test', _utest=True)
File "/home/pviktori/dev/cpython/Lib/idlelib/configDialog.py", line 71, in __init__
self.LoadConfigs()
File "/home/pviktori/dev/cpython/Lib/idlelib/configDialog.py", line 1078, in LoadConfigs
self.LoadFontCfg()
File "/home/pviktori/dev/cpython/Lib/idlelib/configDialog.py", line 980, in LoadFontCfg
self.SetFontSample()
File "/home/pviktori/dev/cpython/Lib/idlelib/configDialog.py", line 858, in SetFontSample
self.labelFontSample.config(font=newFont)
File "/home/pviktori/dev/cpython/Lib/tkinter/__init__.py", line 1331, in configure
return self._configure('configure', cnf, kw)
File "/home/pviktori/dev/cpython/Lib/tkinter/__init__.py", line 1322, in _configure
self.tk.call(_flatten((self._w, cmd)) + self._options(cnf))
_tkinter.TclError: expected integer but got ""
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