Make it possible to use the "unit description" command in replay mode on fogged/shrouded units.

Fixes #3687

src/menu_events.cpp

@@ -649,13 +649,14 @@ void menu_handler::rename_unit()
 unit_map::iterator menu_handler::current_unit()
 {
 	const mouse_handler& mousehandler = pc_.get_mouse_handler_base();
+	const bool see_all = pc_.is_replay() && dynamic_cast<playsingle_controller&>(pc_).get_replay_controller()->see_all();
 
-	unit_map::iterator res = board().find_visible_unit(mousehandler.get_last_hex(), teams()[gui_->viewing_team()]);
+	unit_map::iterator res = board().find_visible_unit(mousehandler.get_last_hex(), teams()[gui_->viewing_team()], see_all);
 	if(res != units().end()) {
 		return res;
 	}
 
-	return board().find_visible_unit(mousehandler.get_selected_hex(), teams()[gui_->viewing_team()]);
+	return board().find_visible_unit(mousehandler.get_selected_hex(), teams()[gui_->viewing_team()], see_all);
 }
 
 // Helpers for create_unit()

src/replay_controller.cpp

@@ -380,3 +380,8 @@ void replay_controller::update_viewing_player()
 	assert(vision_);
 	controller_.update_gui_to_player(vision_ == HUMAN_TEAM ? controller_.gamestate().first_human_team_ : controller_.current_side() - 1, *vision_ == SHOW_ALL);
 }
+
+bool replay_controller::see_all()
+{
+	return vision_ == SHOW_ALL;
+}

src/replay_controller.hpp

@@ -56,6 +56,7 @@ public:
 	void replay_show_team1();
 	void update_teams();
 	void update_viewing_player();
+	bool see_all();
 private:
 	void add_replay_theme();
 	void init();