Tal Einat added the comment:

Indeed, expanding very long texts still degrades the performance of IDLE. But 
the user has to explicitly expand the text (by double-clicking the button) and 
can easily squeeze the text again.

As for your suggestion to show just the first several lines and a "more..." 
button, that would be a significantly more complex solution. It is already easy 
to preview the squeezed text, either by launching an external viewer or by 
copying the text to the clipboard.

Yes, a user could still get large amount of text in the shell by expanding 
large squeezed text. In other words, a user can still shoot himself in the 
foot; but now he'd have to purposefully aim the shotgun at his foot first.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue1529353>
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