Do not create text effects when running headlessly

src/economy.cpp

@@ -2377,7 +2377,7 @@ static void LoadUnloadVehicle(Vehicle *front)
 	 * if _settings_client.gui.loading_indicators == 1, _local_company must be the owner or must be a spectator to show ind., so 1 > 0
 	 * if _settings_client.gui.loading_indicators == 0, do not display indicators ... 0 is never greater than anything
 	 */
-	if (_game_mode != GM_MENU && (_settings_client.gui.loading_indicators > (uint)(front->owner != _local_company && _local_company != COMPANY_SPECTATOR))
+	if (_game_mode != GM_MENU && !IsHeadless() && (_settings_client.gui.loading_indicators > (uint)(front->owner != _local_company && _local_company != COMPANY_SPECTATOR))
 			&& !front->current_order.IsType(OT_LOADING_ADVANCE)) {
 		StringID percent_up_down = STR_NULL;
 		int percent = CalcPercentVehicleFilled(front, &percent_up_down);

src/misc_gui.cpp

@@ -610,7 +610,7 @@ void ShowEstimatedCostOrIncome(Money cost, int x, int y)
  */
 void ShowCostOrIncomeAnimation(int x, int y, int z, Money cost)
 {
-	if (!HasBit(_extra_display_opt, XDO_SHOW_MONEY_TEXT_EFFECTS) || cost == 0) return;
+	if (IsHeadless() || !HasBit(_extra_display_opt, XDO_SHOW_MONEY_TEXT_EFFECTS) || cost == 0) return;
 
 	Point pt = RemapCoords(x, y, z);
 	StringID msg = STR_INCOME_FLOAT_COST;
@@ -632,7 +632,7 @@ void ShowCostOrIncomeAnimation(int x, int y, int z, Money cost)
  */
 void ShowFeederIncomeAnimation(int x, int y, int z, Money transfer, Money income)
 {
-	if (!HasBit(_extra_display_opt, XDO_SHOW_MONEY_TEXT_EFFECTS)) return;
+	if (IsHeadless() || !HasBit(_extra_display_opt, XDO_SHOW_MONEY_TEXT_EFFECTS)) return;
 
 	Point pt = RemapCoords(x, y, z);
 

src/vehicle_gui.cpp

@@ -3523,7 +3523,7 @@ void CcStartStopVehicle(const CommandCost &result, TileIndex tile, uint32_t p1,
 void StartStopVehicle(const Vehicle *v, bool texteffect)
 {
 	assert(v->IsPrimaryVehicle());
-	DoCommandP(v->tile, v->index, 0, _vehicle_command_translation_table[VCT_CMD_START_STOP][v->type], texteffect ? CcStartStopVehicle : nullptr);
+	DoCommandP(v->tile, v->index, 0, _vehicle_command_translation_table[VCT_CMD_START_STOP][v->type], (texteffect && !IsHeadless()) ? CcStartStopVehicle : nullptr);
 }
 
 /** Strings for aircraft breakdown types */