wordsplit: fix whitespace trimming.

* libmailutils/string/wordsplit.c (mu_wordsplit_trimws): Do not
touch quoted nodes.
* libmailutils/tests/wordsplit.at: Test the above change.

@@ -946,6 +946,9 @@ mu_wordsplit_trimws (struct mu_wordsplit *wsp)
   for (p = wsp->ws_head; p; p = p->next)
     {
       size_t n;
+
+      if (p->flags & _WSNF_QUOTE)
+	continue;
       
       /* Skip leading whitespace: */
       for (n = p->v.segm.beg; n < p->v.segm.end && ISWS (wsp->ws_input[n]);

@@ -324,5 +324,15 @@ TESTWSP([delimiter following empty quotes],[],[delim : ws return_delims],
 2: r
 ])
 
+TESTWSP([suppress ws trimming within quotes],[],
+[default delim , ws return_delims],
+[nocomponent,nonewline, formatfield="In message %{text}, "],
+[NF: 5
+0: nocomponent
+1: ,
+2: nonewline
+3: ,
+4: "formatfield=In message %{text}, "
+])
 
 m4_popdef([TESTWSP])