Can't use a binding to a staticresource in a style

[stefanolson]

Current behavior

Error: Preprocessor directive expected. Code:

<local:BrandingAccessor x:Key="BrandingAccessor" />
    <Style TargetType="local:CustomControl1">
        <Setter Property="Background" Value="{Binding Source={StaticResource BrandingAccessor}, Path=Branding.InfoButtonBackgroundBrush}"/>

In output .cs file:

Setters = 
					{
						new global::Windows.UI.Xaml.Setter(global::UnoApp.CustomControl1.BackgroundProperty, __ResourceOwner_0, __ResourceOwner_1 => (Windows.UI.Xaml.Media.Brush)
						#Error // Binding could not be found.
						)
						,
					}

Expected behavior

Should compile as it does in UWP.

How to reproduce it (as minimally and precisely as possible)

Build enclosed project: UnoApp.zip

You'll see in mainpage.xaml that I can successfully reference the accessor from a staticresource:
<Grid Background="{Binding Source={StaticResource BrandingAccessor}, Path=Branding.InfoButtonBackgroundBrush}">

Just doesn't seem to work when in a style in a resource dictionary

Workaround

None yet.

Environment

Nuget Package:

• Uno.UI / Uno.UI.WebAssembly / Uno.UI.Skia
• Uno.WinUI / Uno.WinUI.WebAssembly / Uno.WinUI.Skia
• Uno.SourceGenerationTasks
• Uno.UI.RemoteControl / Uno.WinUI.RemoteControl
• Other:

Nuget Package Version(s):

Affected platform(s):

• iOS
• Android
• WebAssembly
• WebAssembly renderers for Xamarin.Forms
• macOS
• Skia
  • WPF
  • GTK (Linux)
  • Tizen
• Windows
• Build tasks
• Solution Templates

IDE:

• Visual Studio 2017 (version: )
• Visual Studio 2019 (version: 16.8.3 )
• Visual Studio for Mac (version: )
• Rider Windows (version: )
• Rider macOS (version: )
• Visual Studio Code (version: )

Relevant plugins:

• Resharper (version: )

Anything else we need to know?

[MartinZikmund]

Duplicate of #4826