Need to explicitly center dialogs (at least on Windows)
Fixes Issue
@@ -1877,7 +1877,7 @@ def handle_mistreated_latin_shortcuts(registry, event):
handler()
-def show_dialog(dlg, master=None, center=False):
+def show_dialog(dlg, master=None, center=True):
if master is None:
master = tk._default_root
