Company frame truncated when there is only one candidate

[rrudakov]

I use next company settings to trigger popup with candidates even if there is only one candidate:

(setq company-frontends '(company-pseudo-tooltip-frontend
                          company-echo-metadata-frontend))

[aaronjensen]

I can reproduce this as well on Emacs 27.1 on macOS

AFAICT, fit-frame-to-buffer is resizing too narrowly by one (or two, if there's meant to be a space to the right of the candidate) characters. When there are multiple candidates, it resizes correctly.