Feature Request: Regen File Errors On Refocus

[spotandjake]

Currently the grain lsp only reruns when you modify the file this is nice but if you are fixing an issue in another file and come back that error is still there until you change it, it would be nice if on refocus to the file the lsp reran.

[phated]

@spotandjake I think this is probably a feature request for the vscode "language server protocol" library because if they would send a request, we'd respond. I might be wrong, so more investigation is required.