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-rw-r--r--ext/tk/lib/tkextlib/iwidgets/spindate.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/tk/lib/tkextlib/iwidgets/spindate.rb b/ext/tk/lib/tkextlib/iwidgets/spindate.rb
index 2c98eb4629..b3de9ed989 100644
--- a/ext/tk/lib/tkextlib/iwidgets/spindate.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/spindate.rb
@@ -16,7 +16,7 @@ end
class Tk::Iwidgets::Spindate
TkCommandNames = ['::iwidgets::spindate'.freeze].freeze
WidgetClassName = 'Spindate'.freeze
- WidgetClassNames[WidgetClassName] = self
+ WidgetClassNames[WidgetClassName] ||= self
def __boolval_optkeys
super() << 'dayon' << 'monthon' << 'yearon'