show the oos savegame dialog when receiving a debug command in mp

with a different text of course.

fixes #2683

(cherry-picked from commit 7621af9)

src/play_controller.hpp

@@ -266,13 +266,17 @@ class play_controller : public controller_base, public events::observer, public
 	virtual void send_to_wesnothd(const config&, const std::string& = "unknown") const { }
 	virtual bool receive_from_wesnothd(config&) const { return false; }
 	void show_objectives() const;
-protected:
+
 	struct scoped_savegame_snapshot
 	{
 		scoped_savegame_snapshot(const play_controller& controller);
 		~scoped_savegame_snapshot();
 		const play_controller& controller_;
 	};
+
+	saved_game& get_saved_game() { return saved_game_; }
+
+protected:
 	friend struct scoped_savegame_snapshot;
 	void play_slice_catch();
 	bool have_keyboard_focus() override;

src/synced_commands.cpp

@@ -32,6 +32,7 @@
 #include "units/helper.hpp"
 #include "recall_list_manager.hpp"
 #include "resources.hpp"
+#include "savegame.hpp"
 #include "scripting/game_lua_kernel.hpp"
 #include "formula/string_utils.hpp"
 #include "units/types.hpp"
@@ -389,11 +390,24 @@ namespace
 {
 	void debug_notification(const char* message)
 	{
-		utils::string_map symbols;
-		symbols["player"] = resources::controller->current_team().current_player();
-		display::announce_options announce_options;
-		announce_options.lifetime = 250;
-		display::get_singleton()->announce(VGETTEXT(message, symbols), font::NORMAL_COLOR, announce_options);
+		auto& controller = *resources::controller;
+		auto& current_team = controller.current_team();
+		static bool ignore = false;
+		bool show_long_message = controller.is_replay() || !current_team.is_local();
+
+		if(show_long_message && !ignore) {
+			play_controller::scoped_savegame_snapshot snapshot(controller);
+			std::stringstream sbuilder;
+			// TODO: improve message and mark translatable.
+			sbuilder << "The game detected the use of a debug command, maybe another player is cheating";
+			sbuilder << "\n\n" << "details:" << "\n\n" << VGETTEXT(message, {{"player", current_team.current_player()}});
+			savegame::oos_savegame save(controller.get_saved_game(), ignore);
+			save.save_game_interactive(sbuilder.str(), savegame::savegame::YES_NO); // can throw quit_game_exception
+		}
+		else {
+			display::announce_options announce_options;
+			display::get_singleton()->announce(VGETTEXT(message, {{"player", current_team.current_player()}}), font::NORMAL_COLOR, announce_options);
+		}
 	}
 }
 SYNCED_COMMAND_HANDLER_FUNCTION(debug_unit, child,  use_undo, /*show*/, /*error_handler*/)