[gtkmm] Entry widget width

[Greg Rogers <grogers cray com>]

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Trying to set up an entry widget for a 32 bin hex number, so I want the
widget to display at a fixed width and only allow so man characters to
be entered.

This is the code I got to work:
~  modify_font(Pango::FontDescription("fixed"));
~  set_max_length (18);
~  set_width_chars (13);

Why do I need to set the width to 13 to get it to match the max length
of 18 (16 hex characters, plus '0x')?
- --
*************************************************
*   Greg Rogers		Cray Inc.		*
*   grogers cray com	(715)726-4631		*
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