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Fix flicker when opening/closing submenus

--- a/term_util.c

+++ b/term_util.c

@@ -181,6 +181,10 @@

 }

 void qnav_free_block(Qblock* qb) {

+  // erase any stuff underneath where this window is, in case it's outside of

+  // the grid in an area that isn't actively redraw

+  werase(qb->outer_window);

+  wnoutrefresh(qb->outer_window);

   switch (qb->tag) {

   case Qblock_type_qmsg: {

     Qmsg* qm = qmsg_of(qb);

--- a/tui_main.c

+++ b/tui_main.c

@@ -1726,10 +1726,8 @@

       ged_apply_delta_secs(&ged_state, stm_sec(diff));

       ged_do_stuff(&ged_state);

       bool drew_any = false;

-      if (qnav_stack.stack_changed) {

-        werase(stdscr);

+      if (qnav_stack.stack_changed)

         drew_any = true;

-      }

       if (ged_is_draw_dirty(&ged_state) || drew_any) {

         werase(cont_window);

         ged_draw(&ged_state, cont_window);