identifying via menu

From the newsgroup:  identifying by menu pops up multiple menus in
succession if the player picks fewer invent entries than are being
granted, but the second and subsequent ones could cover up the
message window and hide the feedback from prior ones.

If multiple popup menus are needed when identifying, issue --More--
before each menu after the first.  The code seemed to be trying to
do this already, but it should have used wait_synch() rather than
mark_synch(), or perhaps used display_nhwindow(WIN_MESSAGE, TRUE)
instead of either one of those.  For curses, both mark_synch() and
wait_synch() were no-ops.  Now they do something.  X11's behavior
wasn't right either; it seemed to be lagging one message behind
(something I had noticed recently and then forgotten about; I still
don't remember the context then so don't know whether this fixes
that earlier situation).

src/invent.c

@@ -2351,7 +2351,8 @@ menu_identify(int id_limit)
             for (i = 0; i < n; i++, id_limit--)
                 (void) identify(pick_list[i].item.a_obj);
             free((genericptr_t) pick_list);
-            mark_synch(); /* Before we loop to pop open another menu */
+            if (id_limit)
+                wait_synch(); /* Before we loop to pop open another menu */
             first = 0;
         } else if (n == -2) { /* player used ESC to quit menu */
             break;
@@ -2381,8 +2382,9 @@ count_unidentified(struct obj *objchn)
 
 /* dialog with user to identify a given number of items; 0 means all */
 void
-identify_pack(int id_limit,
-              boolean learning_id) /* T: just read unknown identify scroll */
+identify_pack(
+    int id_limit,
+    boolean learning_id) /* T: just read unknown identify scroll */
 {
     struct obj *obj;
     int n, unid_cnt = count_unidentified(gi.invent);
@@ -2396,7 +2398,7 @@ identify_pack(int id_limit,
         for (obj = gi.invent; obj; obj = obj->nobj) {
             if (not_fully_identified(obj)) {
                 (void) identify(obj);
-                if (unid_cnt == 1)
+                if (--unid_cnt < 1)
                     break;
             }
         }