Clicking on another docs version should point to the equivalent page

[jtrakk]

If I'm on the v1.5 Filesystem docs and I click on the v1.6 link in the bottom-left corner, it goes to the home page https://docs.julialang.org/en/v1.6/, not the Filesystem page, which is annoying. I want to go to the equivalent page of the other version.

@fredrikekre says

For the Julia manual you should always be on the v1 version though, it is valid for all of Julia 1.X.

The v1 version differs from earlier versions in some ways, like including methods that don't exist in earlier versions and will confuse earlier readers. Also reading the next (prerelease) version's docs may show what is coming soon.

[fredrikekre]

The v1 version differs from earlier versions in some ways, like including methods that don't exist in earlier versions and will confuse earlier readers.

Do you have any examples? Those should all have compat annotations.

[jtrakk]

I see, not as confusing as I thought then. Still it would be nice to have.

[fredrikekre]

Yea, I guess it can be on a "best-effort" since it can't be guaranteed that the same page exist on the other version.

[mortenpi]

I think it should be possible to check in the browser if the URL in the other version 404-s or not, and decide based on that.

[odow]

Closing as a duplicate of https://github.com/JuliaDocs/Documenter.jl/issues/858