New faces 'tab-line-active' and 'tab-line-inactive' (bug#80742)

This is intended to parallel the 'mode-line-active/inactive'
and 'header-line-active/inactive' distinction.

* doc/emacs/display.texi (Standard Faces): Document the new faces.

* lisp/faces.el (tab-line-active, tab-line-inactive): Add new faces.

* lisp/tab-line.el (tab-line-faces): Add new faces
to MEMBERS arg of 'defgroup'.
(tab-line-auto-hscroll): Use one of the faces
depending on 'mode-line-window-selected-p'.

* src/dispextern.h (CURRENT_TAB_LINE_ACTIVE_FACE_ID_3)
(CURRENT_TAB_LINE_ACTIVE_FACE_ID): New macros
based on header-line equivalents.
(CURRENT_TAB_LINE_HEIGHT): Use CURRENT_TAB_LINE_ACTIVE_FACE_ID.
(face_id): Use TAB_LINE_ACTIVE_FACE_ID and
TAB_LINE_INACTIVE_FACE_ID instead of TAB_LINE_FACE_ID.

* src/xdisp.c (window_box_height, pos_visible_p, init_iterator)
(window_text_pixel_size, display_mode_lines, display_mode_line)
(format-mode-line): Replace all uses of TAB_LINE_FACE_ID with
either a new macro or the new face IDs.

* src/xfaces.c (lookup_basic_face, realize_basic_faces):
Map new face IDs to their lisp symbols.
(syms_of_xfaces): New lisp symbols.

1 files changed, 6 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 3639d1b47e8..3c02002d0ff 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -658,6 +658,12 @@ will change its appearance if the tab buffer has been modified.
 This user option controls which buffers should appear in the tab line.
 By default, this is set to not filter the buffers.
 
++++
+*** New faces 'tab-line-active' and 'tab-line-inactive'.
+These inherit from the 'tab-line' face, but the faces actually used
+on the tab lines are now these two: the selected window uses
+'tab-line-active', non-selected windows use 'tab-line-inactive'.
+
 ** Help
 
 +++