select items in more than one Tk listbox at a time?
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The default for Tk`s listbox widget exports its selection as the
X selection. There can only be one of these at a time.
To turn off this behavior in Tk, use the -exportselection false when
you create the listbox. Or, use the
option add *Listbox.exportselection false
command in the beginning of your script.
Thanks to David Herron for this tip.
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