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I don't know anything about idlelib, but it seems like the following patch fixes the failing test:
diff --git a/Lib/idlelib/idle_test/test_configdialog.py b/Lib/idlelib/idle_test/test_configdialog.py
index aff3c2f..9f495fd 100644
--- a/Lib/idlelib/idle_test/test_configdialog.py
+++ b/Lib/idlelib/idle_test/test_configdialog.py
@@ -41,6 +41,7 @@ def tearDownModule():
 global root, dialog
 idleConf.userCfg = usercfg
 tracers.detach()
+ tracers.clear()
 del dialog
 root.update_idletasks()
 root.destroy()
Extract of ConfigDialog.create_page_highlight():
 self.builtin_theme = tracers.add(
 StringVar(parent), self.var_changed_builtin_theme)
This method contains many tracers.add() calls, but tearDownModule() of Lib/idlelib/idle_test/test_configdialog.py only calls "tracers.detach()" and detatch() doesn't clear VarTrace.untraced list.