* lisp/tab-bar.el: Ignore daemon's initial frame (bug#78896).

(tab-bar--update-tab-bar-lines): Don't set the frame parameter
'tab-bar-lines' in daemon's initial frame because it messes up the
frames when 'format-mode-line' called from 'tab-bar-format-global'
on daemon's initial frame forces focus switch to daemon's initial
frame.  Also don't set 'default-frame-alist' in daemon mode because
'frame-notice-user-settings' copies the frame parameter 'tab-bar-lines'
from 'default-frame-alist' to daemon's initial frame.  Here updating
'default-frame-alist' is not much needed anyway since the frame
parameter 'tab-bar-lines' for new frames is set in 'make_terminal_frame'
and 'x-create-frame'.  'default-frame-alist' might be need only
to handle non-default 'tab-bar-show', but this can be handled by
'toggle-frame-tab-bar' called from 'server-after-make-frame-hook'.
(toggle-frame-tab-bar): Document a useful case of calling it
from 'server-after-make-frame-hook'.

1 files changed, 9 insertions, 3 deletions

diff --git a/lisp/tab-bar.el b/lisp/tab-bar.el
index 306fed34e40..7dc39086044 100644
--- a/lisp/tab-bar.el
+++ b/lisp/tab-bar.el
@@ -280,11 +280,13 @@ a list of frames to update."
     (dolist (frame frame-lst)
       (unless (or (frame-parameter frame 'tab-bar-lines-keep-state)
                   (and (eq auto-resize-tab-bars 'grow-only)
-                       (> (frame-parameter frame 'tab-bar-lines) 1)))
+                       (> (frame-parameter frame 'tab-bar-lines) 1))
+                  ;; Don't enable tab-bar in daemon's initial frame.
+                  (and (daemonp) (not (frame-parameter frame 'client))))
         (set-frame-parameter frame 'tab-bar-lines
                              (tab-bar--tab-bar-lines-for-frame frame)))))
   ;; Update `default-frame-alist'
-  (when (eq frames t)
+  (when (and (eq frames t) (not (daemonp)))
     (setq default-frame-alist
           (cons (cons 'tab-bar-lines
                       (if (and tab-bar-mode (eq tab-bar-show t)) 1 0))
@@ -600,7 +602,11 @@ on each new frame when the global `tab-bar-mode' is disabled,
 or if you want to disable the tab bar individually on each
 new frame when the global `tab-bar-mode' is enabled, by using
 
-  (add-hook \\='after-make-frame-functions #\\='toggle-frame-tab-bar)"
+  (add-hook \\='after-make-frame-functions #\\='toggle-frame-tab-bar)
+
+Or when starting Emacs in daemon mode:
+
+  (add-hook \\='server-after-make-frame-hook #\\='toggle-frame-tab-bar)"
   (interactive)
   (set-frame-parameter frame 'tab-bar-lines
                        (if (> (frame-parameter frame 'tab-bar-lines) 0) 0 1))