bpo-8231: Call idlelib.IdleConf.GetUserCfgDir only once. (#2629)

bpo-8231: Call idlelib.IdleConf.GetUserCfgDir only once. (#2629) · python/cpython@223c7e7

Original file line number	Diff line number	Diff line change
`@@ -103,8 +103,8 @@ def __init__(self, flist=None, filename=None, key=None, root=None):`
`103`	`103`	`self.tkinter_vars = {} # keys: Tkinter event names`
`104`	`104`	`# values: Tkinter variable instances`
`105`	`105`	`self.top.instance_dict = {}`
`106`		`-self.recent_files_path = os.path.join(idleConf.GetUserCfgDir(),`
`107`		`-'recent-files.lst')`
	`106`	`+self.recent_files_path = os.path.join(`
	`107`	`+idleConf.userdir, 'recent-files.lst')`
`108`	`108`	`self.text_frame = text_frame = Frame(top)`
`109`	`109`	`self.vbar = vbar = Scrollbar(text_frame, name='vbar')`
`110`	`110`	`self.width = idleConf.GetOption('main', 'EditorWindow',`