OnPlatform with Thickness breaks XAML Hot Reload

Description

<OnPlatform x:TypeArguments="Thickness"
        x:Key="VeryThick"
        Default="40,20"
        />

Try to hot reload a file where this exists, and nothing with hot reload.

a/ would like this valid XAML to hot reload b/ would like for hot reload to continue working even if other xaml in the file is considered invalid

Errors:

Severity Code Description Project File Line Suppression State Error XLS0414 The type ‘Thickness’ was not found. Verify that you are not missing an assembly reference and that all referenced assemblies have been built. ControlGallery C:\work\ControlGallery\src\ControlGallery\Resources\Styles\Styles.xaml 69

Severity Code Description Project File Line Suppression State Error XHR0008 The name “Thickness” does not exist in the namespace “http://schemas.microsoft.com/dotnet/2021/maui”. ControlGallery C:\work\ControlGallery\src\ControlGallery\Resources\Styles\Styles.xaml 69

Severity Code Description Project File Line Suppression State Error XHR0008 The name “OnPlatform” does not exist in the namespace “http://schemas.microsoft.com/dotnet/2021/maui”. ControlGallery C:\work\ControlGallery\src\ControlGallery\Resources\Styles\Styles.xaml 69

Steps to Reproduce

add that xaml to a resource dictionary and change anything else on the page

Version with bug

Release Candidate 3

Last version that worked well

Unknown/Other

Affected platforms

iOS, Android, Windows, macOS

Affected platform versions

all

Did you find any workaround?

No response

Relevant log output

No response

[mgoertz-msft]

@etvorun Correct, I added support for AssemblyName in Xmlnsdefinition, so this should work now in 17.3 Preview 3.

[msftbot[bot]]

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