Feature: Order flag to unbunch vehicles at depot (#11945)

src/roadveh_cmd.cpp

@@ -387,7 +387,12 @@ CommandCost CmdTurnRoadVeh(DoCommandFlag flags, VehicleID veh_id)
 
 	if (IsTileType(v->tile, MP_TUNNELBRIDGE) && DirToDiagDir(v->direction) == GetTunnelBridgeDirection(v->tile)) return CMD_ERROR;
 
-	if (flags & DC_EXEC) v->reverse_ctr = 180;
+	if (flags & DC_EXEC) {
+		v->reverse_ctr = 180;
+
+		/* Unbunching data is no longer valid. */
+		v->ResetDepotUnbunching();
+	}
 
 	return CommandCost();
 }
@@ -1030,6 +1035,7 @@ bool RoadVehLeaveDepot(RoadVehicle *v, bool first)
 		if (RoadVehFindCloseTo(v, x, y, v->direction, false) != nullptr) return true;
 
 		VehicleServiceInDepot(v);
+		v->LeaveUnbunchingDepot();
 
 		StartRoadVehSound(v);
 
@@ -1587,7 +1593,11 @@ static bool RoadVehController(RoadVehicle *v)
 
 	if (v->current_order.IsType(OT_LOADING)) return true;
 
-	if (v->IsInDepot() && RoadVehLeaveDepot(v, true)) return true;
+	if (v->IsInDepot()) {
+		/* Check if we should wait here for unbunching. */
+		if (v->IsWaitingForUnbunching()) return true;
+		if (RoadVehLeaveDepot(v, true)) return true;
+	}
 
 	v->ShowVisualEffect();