confirm() getting invalid dialog width in windows.

[mattn]

Hi list.

When encoding=utf-8 and call confirm(x) with utf-8 string passed, displaying 
dialog are wider than expected. Because it call GetTextWidth() instead of 
GetTextWidthEnc().

https://gist.github.com/mattn/5863733

diff -r 5759342cde79 src/gui_w32.c
--- a/src/gui_w32.c     Mon Jun 24 22:33:30 2013 +0200
+++ b/src/gui_w32.c     Wed Jun 26 09:28:25 2013 +0900
@@ -3216,7 +3216,7 @@
            if (l == 1 && vim_iswhite(*pend)
                                        && textWidth > maxDialogWidth * 3 / 4)
                last_white = pend;
-           textWidth += GetTextWidth(hdc, pend, l);
+           textWidth += GetTextWidthEnc(hdc, pend, l);
            if (textWidth >= maxDialogWidth)
            {
                /* Line will wrap. */

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