Possible null reference argument for parameter 'visual' in 'Visual? VisualExtensions.GetVisualParent(Visual visual)'.

Possible null reference argument for parameter 'item' in 'bool ICollection<Visual>.Remove(Visual item)'.

Possible null reference argument for parameter 'item' in 'bool ICollection<Visual>.Remove(Visual item)'.

'Markdown._loader' is obsolete

Non-nullable property 'File' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Cancel synchronously blocks. Await CancelAsync instead. (https://github.com/Microsoft/vs-threading/blob/main/doc/analyzers/VSTHRD103.md)

Observe the awaitable result of this method call by awaiting it, assigning to a variable, or passing it to another method (https://github.com/Microsoft/vs-threading/blob/main/doc/analyzers/VSTHRD110.md)

Argument of type 'KeyValuePair<int, Control>' cannot be used for parameter 'item' of type 'KeyValuePair<int, Control?>' in 'void List<KeyValuePair<int, Control?>>.Add(KeyValuePair<int, Control?> item)' due to differences in the nullability of reference types.

Possible null reference argument for parameter 'pen' in 'void DrawingContext.DrawLine(IPen pen, Point p1, Point p2)'.