Draw forecasts at deliverAt of last determination #266

Trio/Sources/Modules/Home/View/Chart/ChartElements/ForecastView.swift

@@ -9,6 +9,7 @@ struct ForecastView: ChartContent {
     let units: GlucoseUnits
     let maxValue: Decimal
     let forecastDisplayType: ForecastDisplayType
+    let lastDeterminationDate: Date
 
     var body: some ChartContent {
         if forecastDisplayType == .lines {
@@ -19,7 +20,7 @@ struct ForecastView: ChartContent {
     }
 
     private func timeForIndex(_ index: Int32) -> Date {
-        let currentTime = Date()
+        let currentTime = lastDeterminationDate
         let timeInterval = TimeInterval(index * 300)
         return currentTime.addingTimeInterval(timeInterval)
     }

Trio/Sources/Modules/Home/View/Chart/MainChartView.swift

@@ -167,7 +167,8 @@ extension MainChartView {
                     maxForecast: state.maxForecast,
                     units: state.units,
                     maxValue: state.maxYAxisValue,
-                    forecastDisplayType: state.forecastDisplayType
+                    forecastDisplayType: state.forecastDisplayType,
+                    lastDeterminationDate: state.determinationsFromPersistence.first?.deliverAt ?? .distantPast
                 )
 
                 /// show glucose value when hovering over it