x/tools/gopls: extract-method is slow in eglot (but not VS Code)

[adonovan]

It routinely takes eglot 13s to apply an extract-method fix that is almost instant in VS Code. (This happens even when the ApplyFix downcall has been patched to set async: true.) The server's computation of the diff is fast but the client's application of the diff is slow. Clearly something is amiss in eglot. The task of this issue is to identify the cause and file an upstream bug, because whatever it is likely affects a number of other eglot operations as well.

(For the sake of reproducibility, I was extracting the block at L1175 of the https://go-review.git.corp.google.com/c/tools/+/531695/1/internal/refactor/inline/inline.go.)

[findleyr]

Until there is evidence that this is a gopls bug, I'm going to put this in the backlog.

[adonovan]

Until there is evidence that this is a gopls bug, I'm going to put this in the backlog.

It's not a gopls bug; this issue is just a reminder to follow up with an eglot bug that impairs gopls usability.

[adonovan]

This is a problem in eglot, not gopls. Closing.