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-rw-r--r--ext/tk/lib/tkextlib/iwidgets/promptdialog.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/tk/lib/tkextlib/iwidgets/promptdialog.rb b/ext/tk/lib/tkextlib/iwidgets/promptdialog.rb
index 620b14b5d5..7c7ff7ad62 100644
--- a/ext/tk/lib/tkextlib/iwidgets/promptdialog.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/promptdialog.rb
@@ -16,7 +16,7 @@ end
class Tk::Iwidgets::Promptdialog
TkCommandNames = ['::iwidgets::promptdialog'.freeze].freeze
WidgetClassName = 'Promptdialog'.freeze
- WidgetClassNames[WidgetClassName] = self
+ WidgetClassNames[WidgetClassName] ||= self
# index method is not available, because it shows index of the entry field
def default(name)