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-rw-r--r--ext/tk/lib/tkextlib/iwidgets/shell.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/tk/lib/tkextlib/iwidgets/shell.rb b/ext/tk/lib/tkextlib/iwidgets/shell.rb
index dabf2e6f25..c560e3ac29 100644
--- a/ext/tk/lib/tkextlib/iwidgets/shell.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/shell.rb
@@ -16,7 +16,7 @@ end
class Tk::Iwidgets::Shell
TkCommandNames = ['::iwidgets::shell'.freeze].freeze
WidgetClassName = 'Shell'.freeze
- WidgetClassNames[WidgetClassName] = self
+ WidgetClassNames[WidgetClassName] ||= self
def activate
tk_call(@path, 'activate') # may return val of deactibate method