fix: keep hold window open when aircraft overflies hold point - #12

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D:\a\HoldPlugin\HoldPlugin\source\HoldPlugin\Plugin.cs(897,13): warning CS8602: Dereference of a possibly null reference. [D:\a\HoldPlugin\HoldPlugin\source\HoldPlugin\HoldPlugin_4chtzltu_wpftmp.csproj]

D:\a\HoldPlugin\HoldPlugin\source\HoldPlugin\Plugin.cs(788,27): warning CS8604: Possible null reference argument for parameter 'segment' in 'void Plugin.SyncPETO(FDR fdr, Segment segment)'. [D:\a\HoldPlugin\HoldPlugin\source\HoldPlugin\HoldPlugin_4chtzltu_wpftmp.csproj]

D:\a\HoldPlugin\HoldPlugin\source\HoldPlugin\ViewModels\HoldSetupViewModel.cs(122,87): warning CS8604: Possible null reference argument for parameter 'PointName' in 'HoldPointAddedCommand.HoldPointAddedCommand(int Index, string PointName)'. [D:\a\HoldPlugin\HoldPlugin\source\HoldPlugin\HoldPlugin_4chtzltu_wpftmp.csproj]

D:\a\HoldPlugin\HoldPlugin\source\HoldPlugin\ViewModels\HoldSetupViewModel.cs(111,81): warning CS8604: Possible null reference argument for parameter 'PointName' in 'HoldPointRemovedCommand.HoldPointRemovedCommand(string PointName)'. [D:\a\HoldPlugin\HoldPlugin\source\HoldPlugin\HoldPlugin_4chtzltu_wpftmp.csproj]

D:\a\HoldPlugin\HoldPlugin\source\HoldPlugin\ViewModels\HoldSetupViewModel.cs(76,38): warning CS8603: Possible null reference return. [D:\a\HoldPlugin\HoldPlugin\source\HoldPlugin\HoldPlugin_4chtzltu_wpftmp.csproj]

D:\a\HoldPlugin\HoldPlugin\source\HoldPlugin\ViewModels\HoldSetupViewModel.cs(48,17): warning CS8602: Dereference of a possibly null reference. [D:\a\HoldPlugin\HoldPlugin\source\HoldPlugin\HoldPlugin_4chtzltu_wpftmp.csproj]

D:\a\HoldPlugin\HoldPlugin\source\HoldPlugin\ViewModels\HoldSetupViewModel.cs(17,12): warning CS8618: Non-nullable field '_button4' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable. [D:\a\HoldPlugin\HoldPlugin\source\HoldPlugin\HoldPlugin_4chtzltu_wpftmp.csproj]

D:\a\HoldPlugin\HoldPlugin\source\HoldPlugin\ViewModels\HoldSetupViewModel.cs(17,12): warning CS8618: Non-nullable field '_button3' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable. [D:\a\HoldPlugin\HoldPlugin\source\HoldPlugin\HoldPlugin_4chtzltu_wpftmp.csproj]

D:\a\HoldPlugin\HoldPlugin\source\HoldPlugin\ViewModels\HoldSetupViewModel.cs(17,12): warning CS8618: Non-nullable field '_button2' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable. [D:\a\HoldPlugin\HoldPlugin\source\HoldPlugin\HoldPlugin_4chtzltu_wpftmp.csproj]

D:\a\HoldPlugin\HoldPlugin\source\HoldPlugin\ViewModels\HoldSetupViewModel.cs(17,12): warning CS8618: Non-nullable field '_button1' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable. [D:\a\HoldPlugin\HoldPlugin\source\HoldPlugin\HoldPlugin_4chtzltu_wpftmp.csproj]