Use 'Assert.IsNotEmpty' instead of 'Assert.IsTrue' (https://learn.microsoft.com/dotnet/core/testing/mstest-analyzers/mstest0037)

Non-nullable field '_closeButton' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Possible null reference argument for parameter 'newContent' in 'void ToolbarToggleButton.UpdateContent(object newContent)'.

Using member 'System.Reflection.Assembly.GetTypes()' which has 'RequiresUnreferencedCodeAttribute' can break functionality when trimming application code. Types might be removed.

Setting SetLastError to 'true' requires runtime marshalling to be enabled (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1420)

Provide an explicit argument for optional parameter 'equivalenceKey', which is non-null and unique for each kind of code action created by this fixer

This compiler extension should not be implemented in an assembly containing a reference to Microsoft.CodeAnalysis.Workspaces. The Microsoft.CodeAnalysis.Workspaces assembly is not provided during command line compilation scenarios, so references to it could cause the compiler extension to behave unpredictably. (https://github.com/dotnet/roslyn/blob/main/docs/roslyn-analyzers/rules/RS1038.md)

This compiler extension should not be implemented in an assembly containing a reference to Microsoft.CodeAnalysis.Workspaces. The Microsoft.CodeAnalysis.Workspaces assembly is not provided during command line compilation scenarios, so references to it could cause the compiler extension to behave unpredictably. (https://github.com/dotnet/roslyn/blob/main/docs/roslyn-analyzers/rules/RS1038.md)

This compiler extension should not be implemented in an assembly containing a reference to Microsoft.CodeAnalysis.Workspaces. The Microsoft.CodeAnalysis.Workspaces assembly is not provided during command line compilation scenarios, so references to it could cause the compiler extension to behave unpredictably. (https://github.com/dotnet/roslyn/blob/main/docs/roslyn-analyzers/rules/RS1038.md)

This compiler extension should not be implemented in an assembly containing a reference to Microsoft.CodeAnalysis.Workspaces. The Microsoft.CodeAnalysis.Workspaces assembly is not provided during command line compilation scenarios, so references to it could cause the compiler extension to behave unpredictably. (https://github.com/dotnet/roslyn/blob/main/docs/roslyn-analyzers/rules/RS1038.md)