Hi all,

it seems that some recent changes in tab-line mode produce additional
vertical space during in-buffer completion.  To reproduce, start with
"emacs -Q" and then eval:

(progn
  (package-initialize t)
  (package-activate 'corfu)
  (global-corfu-mode)
  (setq tab-always-indent 'complete))

Now enter '(def' and hit TAB which gives for me: