Possible null reference argument for parameter 'source' in 'IEnumerable<PSObject> Enumerable.Cast<PSObject>(IEnumerable source)'.

Member 'GetEpxandedRows' does not access instance data and can be marked as static (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1822)

Use 'string.EndsWith(char)' instead of 'string.EndsWith(string)' when you have a string with a single char (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1866)

Possible null reference argument for parameter 'regexFilter' in 'void ShowObjectTreeWindow.OnFilterTextChanged(object? sender, RegexTreeViewTextFilter regexFilter)'.

Converting null literal or possible null value to non-nullable type.