#7735 introduced an internal container control which hosts the child, but it exposed this child in the logical tree, breaking any styles which relied on the `Viewbox.Child` being the logical child of the `Viewbox`.
Fix this by introducing a simple internal `ViewboxContainer` control as the container.
Part of the push to remove generic virtual methods from Avalonia for performance reasons.
Generic methods were added to this interface in #3055 to prevent boxing before we added `Logger.TryGet` (#4135).
Given that since we added `Logger.TryGet`, only enabled logging levels will result in a call to the logger, we can move back to using `params object[]` and boxing; removing the generic interface methods.
It was only used internally in creating `ISetterInstance`s so add a virtual method to `AvaloniaProperty` to do this explicitly without generic virtual methods.
* Merge core libraries.
Everything below `Avalonia.Controls` into `Avalonia.Base`.
* Move new files to correct place.
* Removed unused dirs/projects,
* Removed outdated references from theme assemblies.
* Merge unit tests to match new assembly layout.
* Fixup test namespaces.
* Make directory match namespace.
* Move files to match namespace.
* Move files to match namespace.
* Fix up incorrect namespace.
`Avalonia.Visuals.Media.Imaging` -> `Avalonia.Media.Imaging`.
* Fix resource URL.
* Removed outdated dependencies.
* Added missing project reference.
* Update test namespaces.
* Fix merge error.
* Fix merge errors.
* Fix bad merge in WindowsInteropTest.csproj.
* Fix up merge errors in csprojs.
* Remove merged tests from nuke.
* Fix up namespace.
* Fix compile error.
* Fix failing tests.
Now that more unit tests are present in Avalonia.Base.UnitTests, general `AvaloniaObject` properties are getting registered. Ignore those.
Co-authored-by: Jumar Macato <16554748+jmacato@users.noreply.github.com>
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