Bumps to Uno 4.0

[jeromelaban]

Description of Change

This change bumps Uno to 4.0 preview bits, which include binary breaking changes.

Bugs Fixed

None

• Related to issue #

API Changes

None

Behavioral Changes

Nonoe.

PR Checklist

• Has tests (if omitted, state reason in description)
• Rebased on top of main at time of PR
• Changes adhere to coding standard
• Updated documentation

[jeromelaban]

@mattleibow I assume the build errors are caused by the inclusion of nuget.org in the nuget.config file, though I'm not able to build locally as nuget.org packages are missing. What's the correct route to fix this ? Thanks!

[robloo]

@jeromelaban @mattleibow This is an important issue as without it fixed Skia cannot be used with Uno Platform 4.x (UWP projects).

On my end attempting to construct an SKXamlCanvas with Skia preview version 2.88.0-preview.155 (SkiaSharp & SkiaSharp.Views.Uno) and Uno.UI version 4.0.8 throws the exception:

{System.TypeLoadException: Could not resolve type with token 0100007b from typeref (expected class 'Windows.UI.Core.UIAsyncOperation' in assembly 'Uno, Version=255.255.255.255, Culture=neutral, PublicKeyToken=null')
at System.Runtime.CompilerServices.AsyncVoidMethodBuilder.Start[TStateMachine] (TStateMachine& stateMachine) [0x0002c] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:84
at SkiaSharp.Views.UWP.SKXamlCanvas.Invalidate () [0x00007] in :0
at SkiaSharp.Views.UWP.SKXamlCanvas.OnDpiChanged (Windows.Graphics.Display.DisplayInformation sender, System.Object args) [0x00013] in D:\a\1\s\source\SkiaSharp.Views.Uno\SkiaSharp.Views.Uno\SKXamlCanvas.cs:83
at SkiaSharp.Views.UWP.SKXamlCanvas.Initialize () [0x0000e] in D:\a\1\s\source\SkiaSharp.Views.Uno\SkiaSharp.Views.Uno\SKXamlCanvas.cs:36
at SkiaSharp.Views.UWP.SKXamlCanvas..ctor () [0x00027] in D:\a\1\s\source\SkiaSharp.Views.Uno\SkiaSharp.Views.Uno.Android\SKXamlCanvas.Android.cs:14
at ...Controls.LineChart..ctor () [0x00177] in ...\Source\Controls\Charts\LineChart\LineChart.cs:108 }

[mikebmcl]

Is there any timeframe for this patch being applied and pushed to nuget? Possibly applied against 2.80.3 and published as a minor update of that if 2.88 isn't likely to be ready for release soon?

I've been tinkering with a replacement for my use of SkiaSharp and I'm almost at the point where I need to decide if I'm going to commit to that. Knowing the expected timeframe for this would help me greatly. Thanks!

[robloo]

This corresponds with the SkiaSharp 2.88.0-preview.179 nuget (including SkiaSharp.Views and SkiaSharp.Views.Uno)

Any Uno version < 4.0 must use SkiaSharp < 2.88.0-preview.179 and
Any Uno version >= 4.0 must use SkiaSharp >= 2.88.0-preview.179