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Created attachment 24335 [details]
When I change a Width constraint of a button from = with constant = 0 to <= in the pop-up box which opens after a DoubleClick on the constraint in the designer window the designer crashes with the attached Exception. The 'Reload Document' button does not reload the document. Have to close and reopen.
Microsoft Visual Studio Professional 2017
Microsoft .NET Framework
Xamarin 220.127.116.115 (306f76a)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.
Xamarin.Android SDK 18.104.22.168 (0cd0214)
Xamarin.Android Reference Assemblies and MSBuild support.
Xamarin.iOS and Xamarin.Mac SDK 10.12.0.14 (bf350ba)
Xamarin.iOS and Xamarin.Mac Reference Assemblies and MSBuild support.
This looks to be an issue with the iOS Designer, as opposed to the Xamarin.iOS product itself, so I'm moving it to that product.
Fixed in this PR: https://github.com/xamarin/designer/pull/70
Microsoft Visual Studio Enterprise 2017 Preview
Version 15.4.0 Preview 3.0 [26923.0.d15rel]
Crash is not reproducible. Hence marking as Verified.