Slider: minimum can't be set greater than zero

[jwosty]

This bug is acknowledged in ROADMAP.md, but it didn't yet have an issue, so I thought I'd make it trackable here.

It's currently impossible to create a View.Slider with a minimum value greater than zero because minimum gets set before maximum, causing XF to consider minimum invalid (see: https://forums.xamarin.com/discussion/19131/invalid-value-for-slider-minimum). A fix to this would make sure the minimum gets set after the maximum iff minimum > maximum.

You can work around this for now by using minimum = 0 and doing the math to adjust the value for value and inside valueChanged.

For searchability, here is the exception you get when you try using a positive value for minimum:

System.ArgumentException: Value was an invalid value for Minimum
Parameter name: value
  at Xamarin.Forms.BindableObject.SetValueCore (Xamarin.Forms.BindableProperty property, System.Object value, Xamarin.Forms.Internals.SetValueFlags attributes, Xamarin.Forms.BindableObject+SetValuePrivateFlags privateAttributes) [0x00098] in <036ea626158e48a4b8dcc52d0593c6a6>:0 
  at Xamarin.Forms.BindableObject.SetValue (Xamarin.Forms.BindableProperty property, System.Object value, System.Boolean fromStyle, System.Boolean checkAccess) [0x0003d] in <036ea626158e48a4b8dcc52d0593c6a6>:0 
  at Xamarin.Forms.BindableObject.SetValue (Xamarin.Forms.BindableProperty property, System.Object value) [0x00000] in <036ea626158e48a4b8dcc52d0593c6a6>:0 
  at Xamarin.Forms.Slider.set_Minimum (System.Double value) [0x00000] in <036ea626158e48a4b8dcc52d0593c6a6>:0 
  at Fabulous.DynamicViews.View.UpdateSlider (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevOpt, Fabulous.DynamicViews.ViewElement curr, Xamarin.Forms.Slider target) [0x00303] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\Xamarin.Forms.Core.fs:3030 
  at <StartupCode$Fabulous-Core>[email protected] (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevOpt, Fabulous.DynamicViews.ViewElement curr, Xamarin.Forms.Slider target) [0x00000] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\Xamarin.Forms.Core.fs:2992 
  at <StartupCode$Fabulous-Core>.$ViewElement+Create@47-1[T].Invoke (Microsoft.FSharp.Core.FSharpValueOption`1[T] prev, Fabulous.DynamicViews.ViewElement curr, System.Object target) [0x00000] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\ViewElement.fs:47 
  at Fabulous.DynamicViews.ViewElement.Create () [0x0000d] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\ViewElement.fs:89 
  at <StartupCode$Fabulous-Core>[email protected] (Fabulous.DynamicViews.ViewElement x) [0x00000] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\Xamarin.Forms.Core.fs:4311 
  at Fabulous.DynamicViews.Converters.updateCollectionGeneric$cont@244[T,TargetT] (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevCollOpt, System.Collections.Generic.IList`1[T] targetColl, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] create, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] attach, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] canReuse, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] update, T[] coll, Microsoft.FSharp.Core.Unit unitVar) [0x000e2] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\ViewConverters.fs:258 
  at Fabulous.DynamicViews.Converters.updateCollectionGeneric[T,TargetT] (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevCollOpt, Microsoft.FSharp.Core.FSharpValueOption`1[T] collOpt, System.Collections.Generic.IList`1[T] targetColl, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] create, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] attach, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] canReuse, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] update) [0x00060] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\ViewConverters.fs:240 
  at Fabulous.DynamicViews.View.UpdateAbsoluteLayout (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevOpt, Fabulous.DynamicViews.ViewElement curr, Xamarin.Forms.AbsoluteLayout target) [0x00118] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\Xamarin.Forms.Core.fs:4310 
  at <StartupCode$Fabulous-Core>[email protected] (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevOpt, Fabulous.DynamicViews.ViewElement curr, Xamarin.Forms.AbsoluteLayout target) [0x00000] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\Xamarin.Forms.Core.fs:4292 
  at <StartupCode$Fabulous-Core>.$ViewElement+Create@47-1[T].Invoke (Microsoft.FSharp.Core.FSharpValueOption`1[T] prev, Fabulous.DynamicViews.ViewElement curr, System.Object target) [0x00000] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\ViewElement.fs:47 
  at Fabulous.DynamicViews.ViewElement.Create () [0x0000d] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\ViewElement.fs:89 
  at <StartupCode$Fabulous-Core>[email protected] (Fabulous.DynamicViews.ViewElement x) [0x00000] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\Xamarin.Forms.Core.fs:7235 
  at Fabulous.DynamicViews.Converters.updateCollectionGeneric$cont@244[T,TargetT] (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevCollOpt, System.Collections.Generic.IList`1[T] targetColl, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] create, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] attach, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] canReuse, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] update, T[] coll, Microsoft.FSharp.Core.Unit unitVar) [0x000e2] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\ViewConverters.fs:258 
  at Fabulous.DynamicViews.Converters.updateCollectionGeneric[T,TargetT] (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevCollOpt, Microsoft.FSharp.Core.FSharpValueOption`1[T] collOpt, System.Collections.Generic.IList`1[T] targetColl, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] create, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] attach, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] canReuse, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] update) [0x00060] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\ViewConverters.fs:240 
  at Fabulous.DynamicViews.View.UpdateStackLayout (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevOpt, Fabulous.DynamicViews.ViewElement curr, Xamarin.Forms.StackLayout target) [0x001fb] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\Xamarin.Forms.Core.fs:7234 
  at Fabulous.DynamicViews.View.UpdateFuncStackLayout@ (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevOpt, Fabulous.DynamicViews.ViewElement curr, Xamarin.Forms.StackLayout target) [0x00000] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\Xamarin.Forms.Core.fs:7204 
  at <StartupCode$Fabulous-Core>[email protected] (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevOpt, Fabulous.DynamicViews.ViewElement curr, Xamarin.Forms.StackLayout target) [0x00000] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\Xamarin.Forms.Core.fs:7204 
  at <StartupCode$Fabulous-Core>.$ViewElement+Create@47-1[T].Invoke (Microsoft.FSharp.Core.FSharpValueOption`1[T] prev, Fabulous.DynamicViews.ViewElement curr, System.Object target) [0x00000] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\ViewElement.fs:47 
  at Fabulous.DynamicViews.ViewElement.Create () [0x0000d] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\ViewElement.fs:89 
  at <StartupCode$Fabulous-Core>[email protected] (Fabulous.DynamicViews.ViewElement x) [0x00000] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\Xamarin.Forms.Core.fs:7235 
  at Fabulous.DynamicViews.Converters.updateCollectionGeneric$cont@244[T,TargetT] (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevCollOpt, System.Collections.Generic.IList`1[T] targetColl, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] create, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] attach, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] canReuse, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] update, T[] coll, Microsoft.FSharp.Core.Unit unitVar) [0x000e2] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\ViewConverters.fs:258 
  at Fabulous.DynamicViews.Converters.updateCollectionGeneric[T,TargetT] (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevCollOpt, Microsoft.FSharp.Core.FSharpValueOption`1[T] collOpt, System.Collections.Generic.IList`1[T] targetColl, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] create, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] attach, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] canReuse, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] update) [0x00060] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\ViewConverters.fs:240 
  at Fabulous.DynamicViews.View.UpdateStackLayout (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevOpt, Fabulous.DynamicViews.ViewElement curr, Xamarin.Forms.StackLayout target) [0x001fb] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\Xamarin.Forms.Core.fs:7234 
  at Fabulous.DynamicViews.View.UpdateFuncStackLayout@ (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevOpt, Fabulous.DynamicViews.ViewElement curr, Xamarin.Forms.StackLayout target) [0x00000] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\Xamarin.Forms.Core.fs:7204 
  at <StartupCode$Fabulous-Core>[email protected] (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevOpt, Fabulous.DynamicViews.ViewElement curr, Xamarin.Forms.StackLayout target) [0x00000] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\Xamarin.Forms.Core.fs:7204 
  at <StartupCode$Fabulous-Core>.$ViewElement+Create@47-1[T].Invoke (Microsoft.FSharp.Core.FSharpValueOption`1[T] prev, Fabulous.DynamicViews.ViewElement curr, System.Object target) [0x00000] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\ViewElement.fs:47 
  at Fabulous.DynamicViews.ViewElement.Create () [0x0000d] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\ViewElement.fs:89 
  at <StartupCode$Fabulous-Core>[email protected] (Fabulous.DynamicViews.ViewElement x) [0x00000] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\Xamarin.Forms.Core.fs:7235 
  at Fabulous.DynamicViews.Converters.updateCollectionGeneric$cont@244[T,TargetT] (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevCollOpt, System.Collections.Generic.IList`1[T] targetColl, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] create, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] attach, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] canReuse, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] update, T[] coll, Microsoft.FSharp.Core.Unit unitVar) [0x000e2] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\ViewConverters.fs:258 
  at Fabulous.DynamicViews.Converters.updateCollectionGeneric[T,TargetT] (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevCollOpt, Microsoft.FSharp.Core.FSharpValueOption`1[T] collOpt, System.Collections.Generic.IList`1[T] targetColl, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] create, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] attach, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] canReuse, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] update) [0x00060] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\ViewConverters.fs:240 
  at Fabulous.DynamicViews.View.UpdateStackLayout (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevOpt, Fabulous.DynamicViews.ViewElement curr, Xamarin.Forms.StackLayout target) [0x001fb] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\Xamarin.Forms.Core.fs:7234 
  at Fabulous.DynamicViews.View.UpdateFuncStackLayout@ (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevOpt, Fabulous.DynamicViews.ViewElement curr, Xamarin.Forms.StackLayout target) [0x00000] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\Xamarin.Forms.Core.fs:7204 
  at <StartupCode$Fabulous-Core>[email protected] (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevOpt, Fabulous.DynamicViews.ViewElement curr, Xamarin.Forms.StackLayout target) [0x00000] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\Xamarin.Forms.Core.fs:7204 
  at <StartupCode$Fabulous-Core>.$ViewElement+Create@47-1[T].Invoke (Microsoft.FSharp.Core.FSharpValueOption`1[T] prev, Fabulous.DynamicViews.ViewElement curr, System.Object target) [0x00000] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\ViewElement.fs:47 
  at Fabulous.DynamicViews.ViewElement.Create () [0x0000d] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\ViewElement.fs:89 
  at <StartupCode$Fabulous-Core>[email protected] (Fabulous.DynamicViews.ViewElement x) [0x00000] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\Xamarin.Forms.Core.fs:7235 
  at Fabulous.DynamicViews.Converters.updateCollectionGeneric$cont@244[T,TargetT] (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevCollOpt, System.Collections.Generic.IList`1[T] targetColl, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] create, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] attach, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] canReuse, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] update, T[] coll, Microsoft.FSharp.Core.Unit unitVar) [0x000e2] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\ViewConverters.fs:258 
  at Fabulous.DynamicViews.Converters.updateCollectionGeneric[T,TargetT] (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevCollOpt, Microsoft.FSharp.Core.FSharpValueOption`1[T] collOpt, System.Collections.Generic.IList`1[T] targetColl, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] create, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] attach, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] canReuse, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] update) [0x00060] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\ViewConverters.fs:240 
  at Fabulous.DynamicViews.View.UpdateStackLayout (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevOpt, Fabulous.DynamicViews.ViewElement curr, Xamarin.Forms.StackLayout target) [0x001fb] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\Xamarin.Forms.Core.fs:7234 
  at Fabulous.DynamicViews.View.UpdateFuncStackLayout@ (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevOpt, Fabulous.DynamicViews.ViewElement curr, Xamarin.Forms.StackLayout target) [0x00000] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\Xamarin.Forms.Core.fs:7204 
  at <StartupCode$Fabulous-Core>[email protected] (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevOpt, Fabulous.DynamicViews.ViewElement curr, Xamarin.Forms.StackLayout target) [0x00000] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\Xamarin.Forms.Core.fs:7204 
  at <StartupCode$Fabulous-Core>.$ViewElement+Create@47-1[T].Invoke (Microsoft.FSharp.Core.FSharpValueOption`1[T] prev, Fabulous.DynamicViews.ViewElement curr, System.Object target) [0x00000] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\ViewElement.fs:47 
  at Fabulous.DynamicViews.ViewElement.Create () [0x0000d] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\ViewElement.fs:89 
  at <StartupCode$Fabulous-Core>[email protected] (Fabulous.DynamicViews.ViewElement x) [0x00000] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\Xamarin.Forms.Core.fs:7235 
  at Fabulous.DynamicViews.Converters.updateCollectionGeneric$cont@244[T,TargetT] (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevCollOpt, System.Collections.Generic.IList`1[T] targetColl, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] create, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] attach, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] canReuse, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] update, T[] coll, Microsoft.FSharp.Core.Unit unitVar) [0x000e2] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\ViewConverters.fs:258 
  at Fabulous.DynamicViews.Converters.updateCollectionGeneric[T,TargetT] (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevCollOpt, Microsoft.FSharp.Core.FSharpValueOption`1[T] collOpt, System.Collections.Generic.IList`1[T] targetColl, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] create, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] attach, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] canReuse, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] update) [0x00060] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\ViewConverters.fs:240 
  at Fabulous.DynamicViews.View.UpdateStackLayout (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevOpt, Fabulous.DynamicViews.ViewElement curr, Xamarin.Forms.StackLayout target) [0x001fb] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\Xamarin.Forms.Core.fs:7234 
  at Fabulous.DynamicViews.View.UpdateFuncStackLayout@ (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevOpt, Fabulous.DynamicViews.ViewElement curr, Xamarin.Forms.StackLayout target) [0x00000] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\Xamarin.Forms.Core.fs:7204 
  at <StartupCode$Fabulous-Core>[email protected] (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevOpt, Fabulous.DynamicViews.ViewElement curr, Xamarin.Forms.StackLayout target) [0x00000] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\Xamarin.Forms.Core.fs:7204 
  at <StartupCode$Fabulous-Core>.$ViewElement+Create@47-1[T].Invoke (Microsoft.FSharp.Core.FSharpValueOption`1[T] prev, Fabulous.DynamicViews.ViewElement curr, System.Object target) [0x00000] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\ViewElement.fs:47 
  at Fabulous.DynamicViews.ViewElement.Create () [0x0000d] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\ViewElement.fs:89 
  at Fabulous.DynamicViews.View.UpdateContentPage (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevOpt, Fabulous.DynamicViews.ViewElement curr, Xamarin.Forms.ContentPage target) [0x00295] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\Xamarin.Forms.Core.fs:8966 
  at <StartupCode$Fabulous-Core>[email protected] (Microsoft.FSharp.Core.FSharpValueOption`1[T] prevOpt, Fabulous.DynamicViews.ViewElement curr, Xamarin.Forms.ContentPage target) [0x00000] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\Xamarin.Forms.Core.fs:8936 
  at <StartupCode$Fabulous-Core>.$ViewElement+Create@47-1[T].Invoke (Microsoft.FSharp.Core.FSharpValueOption`1[T] prev, Fabulous.DynamicViews.ViewElement curr, System.Object target) [0x00000] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\ViewElement.fs:47 
  at Fabulous.DynamicViews.ViewElement.Create () [0x0000d] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\ViewElement.fs:89 
  at Fabulous.Core.ProgramRunner`2[model,msg]..ctor (Xamarin.Forms.Application app, Fabulous.Core.Program`3[model,msg,view] program) [0x0007a] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\ElmishProgram.fs:53 
  at Fabulous.Core.ProgramModule.runWithDynamicView[model,msg] (Xamarin.Forms.Application app, Fabulous.Core.Program`3[model,msg,view] program) [0x00000] in C:\projects\elmish-xamarinforms\src\Fabulous.Core\ElmishProgram.fs:227 
  at CueComposer.App+App..ctor (CueComposer.Api+IAudioInterface audioInterface) [0x00016] in /Users/jwostenberg/Code/FSharp/CueComposer/CueComposer/App.fs:246 
  at CueComposer.MacOS.AppDelegate.DidFinishLaunching (Foundation.NSNotification notification) [0x0000b] in /Users/jwostenberg/Code/FSharp/CueComposer/CueComposer.MacOS/AppDelegate.fs:83 
  at (wrapper managed-to-native) AppKit.NSApplication.NSApplicationMain(int,string[])
  at AppKit.NSApplication.Main (System.String[] args) [0x00040] in /Library/Frameworks/Xamarin.Mac.framework/Versions/5.2.1.11/src/Xamarin.Mac/AppKit/NSApplication.cs:100 
  at CueComposer.MacOS.main.main (System.String[] args) [0x00014] in /Users/jwostenberg/Code/FSharp/CueComposer/CueComposer.MacOS/Main.fs:10 

[TimLariviere]

Thanks. Thought this one was handled and forgot about the roadmap.
I think it should be easy to fix.

[TimLariviere]

Ok, so not as easy as I thought after all. :)
If the new minimum > old maximum, it throws, as well as new maximum < old minimum.

A good way to ensure we're correctly updating the slider, I think, is to enforce setting Minimum and Maximum at the same time instead of separately.
It changes a bit from Xamarin.Forms, but I think it makes more sense to do so.

View.Slider(
     minimumMaximum=(10.0, 25.0)
)

[jwosty]

@TimLariviere This breaks backwards compatibility though; doesn't it? Perhaps it is worth it though.

(I can't speak to the correct solution though as I haven't dug into the sources :) )

[jwosty]

Do we also have to factor value into all of this?

[TimLariviere]

Yes, this breaks backwards compatibility.
We're generating the properties independently, so it seemed quite a lot of work just to allow for this kind of dynamic precedence between 2 properties.
And this new property makes a lot more sense to me than independently managing Minimum and Maximum. (name can be better though)
If you change one side, you usually rely on the other side to be a certain value, so better be explicit about it.

Given we've not yet reached v1.0, I think it's ok.

As far as I tested it, value follows just fine without changing it.
If it goes out of bounds, it's automatically adjusted to the nearest bound.

[jwosty]

OK, sounds good then!

[charlesroddie]

The proposed solution is good but I think it needs to be MinimumValueMaximum not just MinimumMaximum.

The bug can also be fixed in Xamarin.Forms xamarin/Xamarin.Forms#1943 (comment)