Ned Deily added the comment:

Looks like there have been longstanding issues with using curses to write to 
the right-/bottom-most character position of a curses window; see open 
Issue8243 and various discussions elsewhere.  Some of the discussions suggest 
the issues dates back to support of physical terminals where writing to the 
last character position caused an automatic scroll up of the lines on a screen 
and suggest it is best to avoid trying to write in that last position.  I'm not 
a curses expert so whether that advice is still relevant today and whether 
Textbox behavior should be changed are open questions.  The behavior could just 
be added to the proposed documentation changes in Issue8243.  Perhaps @twouters 
has a suggestion.

----------
nosy: +ned.deily, twouters
versions: +Python 3.5, Python 3.6 -Python 3.2

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<http://bugs.python.org/issue27693>
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