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-rw-r--r--ext/tk/lib/tkextlib/bwidget/messagedlg.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/tk/lib/tkextlib/bwidget/messagedlg.rb b/ext/tk/lib/tkextlib/bwidget/messagedlg.rb
index 9b46532934..7b62614737 100644
--- a/ext/tk/lib/tkextlib/bwidget/messagedlg.rb
+++ b/ext/tk/lib/tkextlib/bwidget/messagedlg.rb
@@ -17,7 +17,7 @@ end
class Tk::BWidget::MessageDlg
TkCommandNames = ['MessageDlg'.freeze].freeze
WidgetClassName = 'MessageDlg'.freeze
- WidgetClassNames[WidgetClassName] = self
+ WidgetClassNames[WidgetClassName] ||= self
def initialize(parent=nil, keys=nil)
@relative = ''