fix custom amount issue

dydx/dydxPresenters/dydxPresenters/_v4/TakeProfitStopLoss/dydxTakeProfitStopLossViewPresenter.swift

@@ -188,8 +188,9 @@ private class dydxTakeProfitStopLossViewPresenter: HostedViewPresenter<dydxTakeP
         viewModel?.takeProfitStopLossInputAreaViewModel?.lossInputViewModel?.set(value: formattedStopLossUsdcDiff, forUnit: .dollars)
         viewModel?.takeProfitStopLossInputAreaViewModel?.lossInputViewModel?.set(value: formattedStopLossUsdcPercentage, forUnit: .percentage)
 
-        // logic primarily to pre-populate custom amount. need to account 3 situations: 1 take profit order or 1 stop loss order or both
-        if let customSize = triggerOrdersInput?.size?.doubleValue.magnitude, customSize != position?.size?.current?.doubleValue.magnitude {
+        // logic primarily to pre-populate custom amount.
+        // we do not want to turn on custom amount if it is not already on and the order size is the same amount as the position size. The custom amount may already be on if user manually turned it on, or a pre-existing custom amount exists that is less than the position size
+        if let customSize = triggerOrdersInput?.size?.doubleValue.magnitude, customSize != position?.size?.current?.doubleValue.magnitude || viewModel?.customAmountViewModel?.isOn == true {
             let formattedSize = dydxFormatter.shared.raw(number: customSize, digits: marketConfig.displayStepSizeDecimals?.intValue ?? 2)
             viewModel?.customAmountViewModel?.programmaticallySet(newValue: formattedSize)
         }

dydx/dydxViews/dydxViews/_v4/TakeProfitStopLoss/Components/dydxCustomAmountViewModel.swift

@@ -13,7 +13,7 @@ import Utilities
 
 public class dydxCustomAmountViewModel: PlatformTextInputViewModel {
 
-    @Published private var isOn: Bool = false
+    @Published private (set) public var isOn: Bool = false
     @Published public var toggleAction: ((Bool) -> Void)?
 
     @Published public var assetId: String? {