* lisp/tab-bar.el (tab-bar-new-tab-group): Set default to t.

* lisp/tab-bar.el (tab-bar-new-tab-group): Set default to t.

(tab-bar-tabs, tab-bar-select-tab, tab-bar-new-tab-to):
Use tab-bar--current-tab-make instead of tab-bar--current-tab.
(tab-bar--tab): Add arg 'frame' to tab-bar--current-tab-find.
(tab-bar--current-tab, tab-bar--current-tab-make): Move most of body
from the former to the latter, thus reverting tab-bar--current-tab
to its previous behavior.
https://lists.gnu.org/archive/html/emacs-devel/2021-03/msg00959.html