Scheduled dispatch: Caveat text for number of vehicles required

src/lang/extra/english.txt

@@ -2168,7 +2168,7 @@ STR_SCHDISPATCH_SLOT_TOOLTIP_TAG                                :{}Tag {NUM}
 STR_SCHDISPATCH_SUMMARY_NO_LAST_DEPARTURE                       :{BLACK}No previous departures.
 STR_SCHDISPATCH_SUMMARY_LAST_DEPARTURE_PAST                     :{BLACK}Last departure at {TT_TIME}.
 STR_SCHDISPATCH_SUMMARY_LAST_DEPARTURE_FUTURE                   :{BLACK}Last departure has not left yet, it will depart at {TT_TIME}.
-STR_SCHDISPATCH_SUMMARY_L1                                      :{BLACK}This schedule requires {COMMA} vehicle{P "" s}.
+STR_SCHDISPATCH_SUMMARY_L1                                      :{BLACK}This schedule is estimated to require at least {COMMA} vehicle{P "" s}.
 STR_SCHDISPATCH_SUMMARY_L2                                      :{BLACK}This schedule repeats every {STRING1}.
 STR_SCHDISPATCH_SUMMARY_L3                                      :{BLACK}This schedule began at {TT_TIME}, and ends at {TT_TIME}.
 STR_SCHDISPATCH_SUMMARY_L4                                      :{BLACK}Maximum delay of {STRING1} is allowed before the slot is skipped.

src/schdispatch_gui.cpp

@@ -850,14 +850,6 @@ struct SchdispatchWindow : GeneralVehicleWindow {
 						DrawString(ir.left, ir.right, y, STR_SCHDISPATCH_SUMMARY_REUSE_SLOTS_ENABLED);
 						extra_lines++;
 						y += GetCharacterHeight(FS_NORMAL);
-					} else if (!have_conditional) {
-						const int required_vehicle = CalculateMaxRequiredVehicle(v->orders->GetTimetableTotalDuration(), ds.GetScheduledDispatchDuration(), ds.GetScheduledDispatch());
-						if (required_vehicle > 0) {
-							SetDParam(0, required_vehicle);
-							DrawString(ir.left, ir.right, y, STR_SCHDISPATCH_SUMMARY_L1);
-							extra_lines++;
-							y += GetCharacterHeight(FS_NORMAL);
-						}
 					}
 
 					SetTimetableParams(0, ds.GetScheduledDispatchDuration(), true);
@@ -873,6 +865,16 @@ struct SchdispatchWindow : GeneralVehicleWindow {
 					DrawString(ir.left, ir.right, y, STR_SCHDISPATCH_SUMMARY_L4);
 					y += GetCharacterHeight(FS_NORMAL);
 
+					if (!ds.GetScheduledDispatchReuseSlots() && !have_conditional) {
+						const int required_vehicle = CalculateMaxRequiredVehicle(v->orders->GetTimetableTotalDuration(), ds.GetScheduledDispatchDuration(), ds.GetScheduledDispatch());
+						if (required_vehicle > 0) {
+							SetDParam(0, required_vehicle);
+							DrawString(ir.left, ir.right, y, STR_SCHDISPATCH_SUMMARY_L1);
+							extra_lines++;
+							y += GetCharacterHeight(FS_NORMAL);
+						}
+					}
+
 					uint32_t duration = ds.GetScheduledDispatchDuration();
 					for (const DispatchSlot &slot : ds.GetScheduledDispatch()) {
 						if (slot.offset >= duration) {