updated for version 7.3.1245
Problem:    MS-Windows: confirm() dialog text may still not fit.
Solution:   Use GetTextWidthEnc() instead of GetTextWidth() in two more
            places. (Yasuhiro Matsumoto)
diff --git a/src/gui_w32.c b/src/gui_w32.c
index 5ff6192..34d3dd4 100644
--- a/src/gui_w32.c
+++ b/src/gui_w32.c
@@ -3282,7 +3282,7 @@
 	    pend = vim_strchr(pstart, DLG_BUTTON_SEP);
 	    if (pend == NULL)
 		pend = pstart + STRLEN(pstart);	// Last button name.
-	    textWidth = GetTextWidth(hdc, pstart, (int)(pend - pstart));
+	    textWidth = GetTextWidthEnc(hdc, pstart, (int)(pend - pstart));
 	    if (textWidth < minButtonWidth)
 		textWidth = minButtonWidth;
 	    textWidth += dlgPaddingX;	    /* Padding within button */
@@ -3307,7 +3307,7 @@
 	    pend = vim_strchr(pstart, DLG_BUTTON_SEP);
 	    if (pend == NULL)
 		pend = pstart + STRLEN(pstart);	// Last button name.
-	    textWidth = GetTextWidth(hdc, pstart, (int)(pend - pstart));
+	    textWidth = GetTextWidthEnc(hdc, pstart, (int)(pend - pstart));
 	    textWidth += dlgPaddingX;		/* Padding within button */
 	    textWidth += DLG_VERT_PADDING_X * 2; /* Padding around button */
 	    if (textWidth > dlgwidth)