Missing method after upgrade from 8.6

[mhughes668]

After upgrading from Forms from 8.6 to 8.13.8 I have an error in UmbracoFormsExtensionsController.cs

"The name 'GoForward' does not exist in the current context"

I have compared the file between the 8.6 and 8.13.8 versions and they are the same - has the reference to 'GoForward' changed?

code for UmbracoFormsExtensionsController came from here - https://gist.github.com/lars-erik/7a0028f28b93385574b68ce11276bd7a

The only change that was made was upgrading from 8.6 forms to 8.3 forms using nuget. If I go back to 8.6 then I get no errors and the website works fine.

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This item has been added to our backlog AB#31793

[AndyButland]

It looks like this was made private as opposed to protected back in 8.7. It shouldn't have been as that's a breaking change, so we can look at reverting this. It's historically a bit inconsistent as GoBackward is private in 8.6, so I can see why it got tidied up, but that change should have waited for the next major version.