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-rw-r--r--ext/tk/lib/tkextlib/iwidgets/toolbar.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/tk/lib/tkextlib/iwidgets/toolbar.rb b/ext/tk/lib/tkextlib/iwidgets/toolbar.rb
index c9f1753c70..5b474c3816 100644
--- a/ext/tk/lib/tkextlib/iwidgets/toolbar.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/toolbar.rb
@@ -16,7 +16,7 @@ end
class Tk::Iwidgets::Toolbar
TkCommandNames = ['::iwidgets::toolbar'.freeze].freeze
WidgetClassName = 'Toolbar'.freeze
- WidgetClassNames[WidgetClassName] = self
+ WidgetClassNames[WidgetClassName] ||= self
def __tkvariable_optkeys
super() << 'helpvariable'