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-rw-r--r--ext/tk/lib/tkextlib/iwidgets/selectionbox.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/tk/lib/tkextlib/iwidgets/selectionbox.rb b/ext/tk/lib/tkextlib/iwidgets/selectionbox.rb
index bf9b5ec30a..eb8fe3ad52 100644
--- a/ext/tk/lib/tkextlib/iwidgets/selectionbox.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/selectionbox.rb
@@ -16,7 +16,7 @@ end
class Tk::Iwidgets::Selectionbox
TkCommandNames = ['::iwidgets::selectionbox'.freeze].freeze
WidgetClassName = 'Selectionbox'.freeze
- WidgetClassNames[WidgetClassName] = self
+ WidgetClassNames[WidgetClassName] ||= self
def __boolval_optkeys
super() << 'itemson' << 'selectionon'