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Add dimming of inactive/non-foreground menu contents

--- a/term_util.c

+++ b/term_util.c

@@ -255,6 +255,12 @@

   ++qm->items_count;

   qm->ncurses_items[qm->items_count] = NULL;

 }

+void qmenu_set_displayed_active(Qmenu* qm, bool active) {

+  // Could add a flag in the Qmenu to avoid redundantly changing this stuff.

+  set_menu_fore(qm->ncurses_menu, active ? A_BOLD : A_DIM);

+  set_menu_back(qm->ncurses_menu, active ? A_NORMAL : A_DIM);

+  set_menu_grey(qm->ncurses_menu, active ? A_DIM : A_DIM);

+}

 void qmenu_push_to_nav(Qmenu* qm) {

   qm->ncurses_menu = new_menu(qm->ncurses_items);

   set_menu_mark(qm->ncurses_menu, " > ");

--- a/term_util.h

+++ b/term_util.h

@@ -127,6 +127,7 @@

 void qmenu_set_title(Qmenu* qm, char const* title);

 void qmenu_add_choice(Qmenu* qm, char const* text, int id);

 void qmenu_add_spacer(Qmenu* qm);

+void qmenu_set_displayed_active(Qmenu* qm, bool active);

 void qmenu_push_to_nav(Qmenu* qm);

 bool qmenu_drive(Qmenu* qm, int key, Qmenu_action* out_action);

 Qmenu* qmenu_of(Qblock* qb);

--- a/tui_main.c

+++ b/tui_main.c

@@ -2287,7 +2287,18 @@

       for (Usz i = 0; i < qnav_stack.count; ++i) {

         Qblock* qb = qnav_stack.blocks[i];

         if (qnav_stack.stack_changed) {

-          qblock_print_frame(qb, i == qnav_stack.count - 1);

+          bool is_frontmost = i == qnav_stack.count - 1;

+          qblock_print_frame(qb, is_frontmost);

+          switch (qb->tag) {

+          case Qblock_type_qmsg:

+            break;

+          case Qblock_type_qmenu: {

+            Qmenu* qm = qmenu_of(qb);

+            qmenu_set_displayed_active(qm, is_frontmost);

+          } break;

+          case Qblock_type_qform:

+            break;

+          }

         }

         touchwin(qb->outer_window);

         wnoutrefresh(qb->outer_window);