Bitwise-or operator used on a sign-extended operand; consider casting to a smaller unsigned type first

XML comment has cref attribute 'Draw(Rect, Attribute, Attribute, Rect, bool, ConsoleDriver)' that could not be resolved

Possible null reference assignment.

Nullability of reference types in value of type 'KeyValuePair<string, ColorScheme?>' doesn't match target type 'KeyValuePair<string, ColorScheme>'.

The variable 'initialized' is assigned but its value is never used

The variable 'superViewInitialized' is assigned but its value is never used

Possible null reference argument for parameter 'text' in 'bool Color.TryParse(string text, out Color? color)'.

Do not use Assert.True() to check if a value exists in a collection. Use Assert.Contains instead. (https://xunit.net/xunit.analyzers/rules/xUnit2017)

The type argument string? from ColorTestsTheoryDataGenerators.TryParse_string_Returns_True_For_Valid_Inputs is nullable, while the type of the corresponding test method parameter input is not. Make the TheoryData type non-nullable, or make the test method parameter nullable. (https://xunit.net/xunit.analyzers/rules/xUnit1040)