Debug demo map: four allied masters with every room and creature against an endless hero gate

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/main.rs

@@ -12,6 +12,7 @@ mod campaign_doc;
 mod cloud;
 mod commands;
 mod demo;
+mod demo_map;
 mod editor;
 mod events;
 mod dwarves;
@@ -1660,6 +1661,28 @@ app.pending_briefing = briefing_of(&menu.campaign_doc, i);
                         ui.show_help = false;
                         autosave_t = 0.0;
                     }
+                    MenuAction::DemoMap => {
+                        // debug: four allied masters with every room and creature against an
+                        // endless gate (never autosaved, counts for no achievement)
+                        if app.match_mode || app.game.in_match() {
+                            app.leave_match();
+                        }
+                        app.seed = next_seed(app.seed);
+                        (app.game, app.cam) = Game::new_demo_map(app.seed);
+                        apply_game_settings(&mut app.game, &app.settings);
+                        app.coop = false;
+                        app.recorded = false;
+                        app.tutorial = false;
+                        app.custom_campaign = None;
+                        app.custom_progress = None;
+                        app.custom_mission_index = None;
+                        app.custom_next_index = None;
+                        menu.page = None;
+                        r3d.invalidate();
+                        ui.log.clear();
+                        ui.show_help = false;
+                        autosave_t = 0.0;
+                    }
                     MenuAction::OpenRepo => platform::open_url(menu::REPO_URL),
                     MenuAction::OpenClaudeCode => platform::open_url(menu::CLAUDE_CODE_URL),
                     MenuAction::OpenOpenCode => platform::open_url(menu::OPENCODE_URL),
@@ -1700,7 +1723,7 @@ app.pending_briefing = briefing_of(&menu.campaign_doc, i);
                         app.tutorial = false;
                         if app.match_mode || app.game.in_match() {
                             app.leave_match();
-                        } else if app.game.state == 0 {
+                        } else if app.game.state == 0 && app.game.demo_map.is_none() {
                             platform::storage_set(save::AUTOSAVE_KEY, &app.autosave_json());
                             menu.has_autosave = true;
                         }
@@ -1980,7 +2003,8 @@ app.pending_briefing = briefing_of(&campaign, i);
             // the world runs in fixed steps: the speed setting only feeds more time into them
             app.game.update(dt * app.settings.game_speed.max(1.0));
             // autosave: snapshot for leaving the tab + regular autosave
-            if app.game.state == 0 && !app.match_mode {
+            // (the debug demo map never replaces the autosave)
+            if app.game.state == 0 && !app.match_mode && app.game.demo_map.is_none() {
                 cache_t += dt;
                 autosave_t += dt;
                 if cache_t >= AUTOSAVE_CACHE_EVERY {