Current behavior

Any styles defined in Themes\Generic.xaml are not found.

Expected behavior

This is the standard location for default styles in UWP apps and needs to be supported. It is also common practice to use MergedDictionary to pull in resources from other directories referenced by Generic.xaml.

When Uno searched for an implicit/default style for any TemplatedControl defined in Generic.xaml it should be found.

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

As described.

Workaround

Define styles in App.xaml. Uno correctly handles nested MergedDictionaries so the following works:

<Application
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <XamlControlsResources
                    xmlns="using:Microsoft.UI.Xaml.Controls" />
                <ResourceDictionary
                    Source="ms-appx:///Themes/Generic.xaml" />
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </Application.Resources>
</Application>

Environment

• 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): 3.1.6

Affected platform(s):

• iOS
• Android - only one tested, likely all affected
• 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: )
• 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?