Fix text builder did not respect wide/fullwidth charactors for title line.

tests/test_build_text.py

@@ -0,0 +1,44 @@
+# -*- coding: utf-8 -*-
+"""
+    test_build_text
+    ~~~~~~~~~~~~~~~
+
+    Test the build process with Text builder with the test root.
+
+    :copyright: Copyright 2007-2013 by the Sphinx team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+
+from textwrap import dedent
+
+from docutils.utils import column_width
+
+from util import *
+
+
+def with_text_app(*args, **kw):
+    default_kw = {
+        'buildername': 'text',
+        'srcdir': '(empty)',
+        'confoverrides': {
+            'project': 'text',
+            'master_doc': 'contents',
+        },
+    }
+    default_kw.update(kw)
+    return with_app(*args, **default_kw)
+
+
+@with_text_app()
+def test_multibyte_title_line(app):
+    title = u'\u65e5\u672c\u8a9e'
+    underline = u'=' * column_width(title)
+    content = u'\n'.join((title, underline, u''))
+
+    (app.srcdir / 'contents.rst').write_text(content, encoding='utf-8')
+    app.builder.build_all()
+    result = (app.outdir / 'contents.txt').text(encoding='utf-8')
+
+    expect_underline = underline.replace('=', '*')
+    result_underline = result.splitlines()[2].strip()
+    assert expect_underline == result_underline