Reformatting #if blocks controlling attributes changes the meaning of the code

[SteveGilham]

Using fantomas 2.8.1 global tool

fantomas . --recurse --indent 2 --pageWidth 132

Before

    [<
#if NETCOREAPP2_1
      Builder.Object;
#else
      Widget;
#endif
      DefaultValue(true)>]
    val mutable mainWindow : Window

After

    [<Builder.Object>]
    [<DefaultValue(true)>]
    val mutable mainWindow : Window

Before

do
[<assembly:InternalsVisibleTo("AltCover.FSApi, PublicKey=0024000004800000940000000602000000240000525341310004000001000100916443A2EE1D294E8CFA7666FB3F512D998D7CEAC4909E35EDB2AC1E104DE68890A93716D1D1931F7228AAC0523CACF50FD82CDB4CCF4FF4BF0DED95E3A383F4F371E3B82C45502CE74D7D572583495208C1905E0F1E8A3CCE66C4C75E4CA32E9A8F8DEE64E059C0DC0266E8D2CB6D7EBD464B47E062F80B63D390E389217FB7")>]

#if NETCOREAPP2_0
[<assembly:InternalsVisibleTo("dotnet-altcover, PublicKey=0024000004800000940000000602000000240000525341310004000001000100916443A2EE1D294E8CFA7666FB3F512D998D7CEAC4909E35EDB2AC1E104DE68890A93716D1D1931F7228AAC0523CACF50FD82CDB4CCF4FF4BF0DED95E3A383F4F371E3B82C45502CE74D7D572583495208C1905E0F1E8A3CCE66C4C75E4CA32E9A8F8DEE64E059C0DC0266E8D2CB6D7EBD464B47E062F80B63D390E389217FB7")>]
[<assembly:InternalsVisibleTo("global-altcover, PublicKey=0024000004800000940000000602000000240000525341310004000001000100916443A2EE1D294E8CFA7666FB3F512D998D7CEAC4909E35EDB2AC1E104DE68890A93716D1D1931F7228AAC0523CACF50FD82CDB4CCF4FF4BF0DED95E3A383F4F371E3B82C45502CE74D7D572583495208C1905E0F1E8A3CCE66C4C75E4CA32E9A8F8DEE64E059C0DC0266E8D2CB6D7EBD464B47E062F80B63D390E389217FB7")>]
#endif

[<assembly:CLSCompliant(true)>]
...
()

After

[<assembly:InternalsVisibleTo("AltCover.FSApi, PublicKey=0024000004800000940000000602000000240000525341310004000001000100916443A2EE1D294E8CFA7666FB3F512D998D7CEAC4909E35EDB2AC1E104DE68890A93716D1D1931F7228AAC0523CACF50FD82CDB4CCF4FF4BF0DED95E3A383F4F371E3B82C45502CE74D7D572583495208C1905E0F1E8A3CCE66C4C75E4CA32E9A8F8DEE64E059C0DC0266E8D2CB6D7EBD464B47E062F80B63D390E389217FB7")>]
[<assembly:InternalsVisibleTo("dotnet-altcover, PublicKey=0024000004800000940000000602000000240000525341310004000001000100916443A2EE1D294E8CFA7666FB3F512D998D7CEAC4909E35EDB2AC1E104DE68890A93716D1D1931F7228AAC0523CACF50FD82CDB4CCF4FF4BF0DED95E3A383F4F371E3B82C45502CE74D7D572583495208C1905E0F1E8A3CCE66C4C75E4CA32E9A8F8DEE64E059C0DC0266E8D2CB6D7EBD464B47E062F80B63D390E389217FB7")>]
[<assembly:InternalsVisibleTo("global-altcover, PublicKey=0024000004800000940000000602000000240000525341310004000001000100916443A2EE1D294E8CFA7666FB3F512D998D7CEAC4909E35EDB2AC1E104DE68890A93716D1D1931F7228AAC0523CACF50FD82CDB4CCF4FF4BF0DED95E3A383F4F371E3B82C45502CE74D7D572583495208C1905E0F1E8A3CCE66C4C75E4CA32E9A8F8DEE64E059C0DC0266E8D2CB6D7EBD464B47E062F80B63D390E389217FB7")>]
[<assembly:CLSCompliant(true)>]
...
()
#if NETCOREAPP2_0
#endif

[nojaf]

Hi @SteveGilham, Fantomas is now (to some degree) able to format both branches of #if statements.
See 877c164#diff-887c693cf55cfd4306828ac9bbb7c81cR191 as an example.