Feature: LSP navigation updates diffs

[delabere]

Describe what this PR does / why we need it

When you navigate using LSP or a command like gf while reviewing a change using the use_local_fs option, you lose the diff, even if the file you navigated to was part of the change.

This change allows you to navigate around a PR's changed files using your LSP

Screen.Recording.2024-04-20.at.19.05.43.mov

Does this pull request fix one issue?

Fixes #535

Describe how you did it

Review layouts keep track of files, these are the files that you see populated in the files pane after opening a review.
After entering a buffer, if the filepath is not octo://..., I assume that it is a local file and I check whether the file is part of the layout's file's. If it is then I update the review to that file using review.layout:set_file(file)

Describe how to verify it

You need to use use_local_fs and review a PR that has multiple files, where you can navigate between those files via LSP.

Special notes for reviews

There is some unintended behaviour with this change. When you navigate to the right buffer in the diff you see this message:

It doesn't happen if I comment out review.layout:set_file(file) in my change, so I assume that the side-effects of this are triggering more autocomands

[jondkinney]

Seems like this would be a good change! Will this be included in a future release sometime soon?

[delabere]

@pwntester 👋 just giving this one a nudge

[pwntester]

@delabere took a look some time ago and could not figure out why its popping that autocmd error. Will take another look since merging it in this state will results in issues complaining about the error.