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Fix recombination of side windows (Bug#80665)

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* lisp/window.el (window--make-major-side-window): Protect the
sibling (the main-window group) from recombination.  Without
this, deleting a side window can flatten the group into the
root, causing subsequent side windows on other sides to be
placed incorrectly (Bug#80665).

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This commit is contained in:
Emil Ingelman Sahlén
2026-03-27 19:48:02 +01:00
committed by Martin Rudalics
parent 3b7d9e37ce
commit 57b119b296
1 changed files with 8 additions and 0 deletions
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8
lisp/window.el
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@@ -1010,6 +1010,14 @@ and may be called only if no window on SIDE exists yet."
(cons `(dedicated . ,(or display-buffer-mark-dedicated 'side))
alist))))
(when window
;; Protect the sibling (the main-window group) from recombination.
;; Without this, deleting a side window can flatten the group into
;; the root, causing subsequent side windows on other sides to be
;; placed incorrectly (Bug#80665).
(when-let* ((sibling (or (window-prev-sibling window)
(window-next-sibling window)))
(window-child sibling))
(set-window-combination-limit sibling t))
;; Initialize `window-side' parameter of new window to SIDE and
;; make that parameter persistent.
(set-window-parameter window 'window-side side)