Changing `ResourceDictonary` xaml file requires cleaning the project

[karmeye]

Describe the bug

When I make changes in Resource Dictionary xaml files I have to clean the project for the changes to take effect. Hot reload doesn't work, even stopping and running the app again does not work. I have to rebuild the project that contains the xaml file.

Steps to reproduce the bug

1. Create a Blank App (WinUI 3) project and a Class Library (WinUI 3)
2. Make the blank app project dependent on the class library
3. Move the MainWindow from the blank app project to the class library
4. Add a Resource Dictionary to the class library that styles some control in MainWindow
5. Changes made in the resource dictionary will only be reflected in the UI after cleaning/rebuilding the class library and running the blank app project again.

Expected behavior

• Changes should show without cleaning the project
• If hot reload is enabled changes should occur immediately

Screenshots

No response

NuGet package version

Windows App SDK 1.4.5: 1.4.240211001

Packaging type

Unpackaged

Windows version

Windows 11 version 22H2 (22621, 2022 Update)

IDE

Visual Studio 2022

Additional context

Only reason I use a Class Library project instead of putting the resource dictionary and windows/controls directly in the Blank App project is that I'm trying to open a WinUI window from a WinForm project, so I have to reference a class library containing the WinUI window (see https://github.com/microsoft/WindowsAppSDK/discussions/4203)

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