Serhiy Storchaka added the comment:

Yes, but setting the highlightthickness option can be optional too.

    self.scrollbarView = Scrollbar(frameText, orient=VERTICAL,
                                   takefocus=FALSE)
    try:
        self.scrollbarView['highlightthickness'] = 0
    except TclError:
        pass

or

    self.scrollbarView = Scrollbar(frameText, orient=VERTICAL,
                                   takefocus=FALSE)
    if not ttk:
        self.scrollbarView['highlightthickness'] = 0

Otherwise I think it is not worth to apply these changes to maintained 
releases. 3.4 will switched to security fixes only mode soon, but 2.7 has long 
support term. Bugfix release should continue to work on platforms that are 
shipped with Tcl/Tk 8.4.

----------

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue24750>
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