[PATCH, svnmerge] Try "stty -a" to find out console width

Hello,

svnmerge automatically formats and word-wraps its help screens to the user
console width (if it manages to extract it). It has several methods (for
different operating systems), and this patch adds another fallback: it tries
calling "stty -a" and parsing its output with a simple regular expression.
This should work well on some UNIX flavours (including Linux).

Committed as r18008.

[[[
When trying to get the width of the console, also try parsing the output
of "stty -a" which usually contains this information.

* contrib/client-side/svnmerge.py:
  (console_width): Try parsing 'stty -a' output.
]]]

-- 
Giovanni Bajo

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