updated for version 7.3.799

Problem:    The color column is not correct when entering a buffer. (Ben
            Fritz)
Solution:   Call check_colorcolumn() if 'textwidth' changed. (Christian
            Brabandt)

src/buffer.c

@@ -1441,6 +1441,8 @@ set_curbuf(buf, action)
 enter_buffer(buf)
     buf_T	*buf;
 {
+    long old_tw = curbuf->b_p_tw;
+
     /* Copy buffer and window local option values.  Not for a help buffer. */
     buf_copy_options(buf, BCO_ENTER | BCO_NOHELP);
     if (!buf->b_help)
@@ -1464,6 +1466,8 @@ enter_buffer(buf)
 
 #ifdef FEAT_SYN_HL
     curwin->w_s = &(buf->b_s);
+    if (old_tw != buf->b_p_tw)
+	check_colorcolumn(curwin);
 #endif
 
     /* Cursor on first line by default. */