bug#62427: tab-bar-new-tab-to now handles cases with multiple side-windows

[Juri Linkov <juri@linkov.net>]

> Thanks, installed on emacs-29 branch, and closing the bug.

From the docstring of 'tab-bar-new-tab-choice':

  If the value is the symbol `window', then keep the selected
  window as a single window on the new tab, and keep all its
  window parameters except `window-atom' and `window-side'.
                                              ===========

So still need to remove `window-side' in this case:

(progn
  (display-buffer-in-side-window (get-buffer-create "*hello*")
                                 '((side . right)
                                   (slot . 1)))
  (select-window
   (display-buffer-in-side-window (get-buffer-create "*world*")
                                  '((side . right)
                                    (slot . 2))))
  (tab-bar-move-window-to-tab)
  (split-window))

This should handle it:

diff --git a/lisp/tab-bar.el b/lisp/tab-bar.el
index 61e177c051d..42fc5a23990 100644
--- a/lisp/tab-bar.el
+++ b/lisp/tab-bar.el
@@ -1588,7 +1588,9 @@ tab-bar-new-tab-to
           (delete-other-windows)
           (if (eq tab-bar-new-tab-choice 'window)
               ;; Create new unique window from remaining window
-              (window-state-put (window-state-get))
+              (progn
+                (set-window-parameter nil 'window-side nil)
+                (window-state-put (window-state-get)))
             ;; Create a new window to get rid of old window parameters
             ;; (e.g. prev/next buffers) of old window.
             (split-window) (delete-window))))