not PR #1102 - map refresh during #terrain

This fixes the part of pull request #1102 by entrez dealing with the
map refresh side of things.  It was pulled out of a much larger patch
that also deals with terminal window resize for tty.

Using ^R when getpos() is in operation, whether actually picking a
position for something or browsing the map during #terrain or post
detection magic, it was reconstructing the known map and positioning
the cursor on the hero instead redrawing the selected terrain subset
or detected objects/monsters/whatever.  There's already a routine to
redraw the current view of the map without recalculating it, but it
wasn't being used for ^R during getpos operation.

src/do_name.c

@@ -730,9 +730,20 @@ enum hilite_states {
 static void
 getpos_refresh(int *hilite_statep)
 {
-    if (*hilite_statep == Hilite_Active)
+    int redrawflags = docrtRefresh;
+
+    if (*hilite_statep == Hilite_Active) {
+        /* removing SHOWVALID markers; just redraw the map */
         (*getpos_hilitefunc)(2); /* tmp_at(DISP_END) */
-    docrt(); /* redraw everything */
+        redrawflags |= docrtMapOnly;
+    } else {
+        /* ^R: player requested that the screen be redrawn; maybe something
+         * outside of nethack has clobbered it; clear it, redisplay what we
+         * think the map already shows rather than recalculate that, do a
+         * full status update, and show perminv, if applicable */
+        ; /* just docrtRefresh */
+    }
+    docrt_flags(redrawflags);
     *hilite_statep = Hilite_Inactive;
 }
 
@@ -928,6 +939,7 @@ getpos(coord *ccp, boolean force, const char *goal)
                 getpos_help(force, goal);
             /* ^R: docrt(), hilite_state = Hilite_Inactive */
             getpos_refresh(&hilite_state);
+            curs(WIN_MAP, cx, cy);
             /* update message window to reflect that we're still targeting */
             show_goal_msg = TRUE;
         } else if (c == gc.Cmd.spkeys[NHKF_GETPOS_SHOWVALID]) {