Fix missing NotifyCountChanged in AvaloniaList.AddRange
Fix missing NotifyCountChanged in AvaloniaList.AddRange

SuperJMN/Avalonia,AvaloniaUI/Avalonia,grokys/Perspex,AvaloniaUI/Avalonia,SuperJMN/Avalonia,SuperJMN/Avalonia,AvaloniaUI/Avalonia,AvaloniaUI/Avalonia,SuperJMN/Avalonia,SuperJMN/Avalonia,AvaloniaUI/Avalonia,SuperJMN/Avalonia,SuperJMN/Avalonia,grokys/Perspex,AvaloniaUI/Avalonia,AvaloniaUI/Avalonia