`tab-bar-tab-group-face-default' hard codes the invocation to `tab-bar-tab-face-default' but should it instead invoke `tab-bar-tab-face-function' to benefit from a custom function? (defun tab-bar-tab-group-face-default (tab) (if (not (or (eq (car tab) 'current-tab) (funcall tab-bar-tab-group-function tab))) 'tab-bar-tab-ungrouped * (tab-bar-tab-face-default tab)))*;; should the last line be something like this? * (funcall tab-bar-tab-face-function tab)))* I checked the latest `tab-bar' source code this morning and this hasn't yet been addressed, if indeed this is unintended behavior. See https://github.com/emacs-mirror/emacs/blob/master/lisp/tab-bar.el#L1021 Thank you for all your hard work on the Emacs ecosystem. -Stephane In GNU Emacs 29.3 (build 1, x86_64-apple-darwin18.7.0, NS appkit-1671.60 Version 10.14.6 (Build 18G9323)) of 2024-03-24 built on builder10-14.lan Windowing system distributor 'Apple', version 10.3.2113 System Description: macOS 12.7.5 Configured using: 'configure --with-ns '--enable-locallisppath=/Library/Application Support/Emacs/${version}/site-lisp:/Library/Application Support/Emacs/site-lisp' --with-modules 'CFLAGS=-DFD_SETSIZE=10000 -DDARWIN_UNLIMITED_SELECT' --with-x-toolkit=no' Configured features: ACL GLIB GMP GNUTLS JPEG JSON LIBXML2 MODULES NOTIFY KQUEUE NS PDUMPER PNG RSVG SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER ZLIB Important settings: value of $LANG: en_US.UTF-8 locale-coding-system: utf-8-unix Major mode: ELisp/l Minor modes in effect: global-git-commit-mode: t shell-dirtrack-mode: t rainbow-mode: t flymake-mode: t 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