x/tools/gopls/internal/regtest: Test_Issue38211 is flaky #44098
Description
Recent example:
freebsd-amd64-12_0: https://build.golang.org/log/3b09d544e27e063edc32baadd6008e204ec1d5e5
--- FAIL: Test_Issue38211 (7.09s)
--- FAIL: Test_Issue38211/singleton (1.75s)
diagnostics_test.go:680: formatting before save: before receipt of formatting edits, buffer version changed from 1 to 2
...which looks like a race. This may be a recent flake, or at least it started flaking more often recently. #44035 might provide a fix, but filing this issue to track the de-flaking of this test.
CC @heschik @stamblerre