emacs-27 f4acd7a: Split windows evenly when 'min-margins' parameter was set (Bug#44483)

[Martin Rudalics]

branch: emacs-27
commit f4acd7a924fbb6400130e5091ea37e50e2d0fac2
Author: Martin Rudalics <rudalics@gmx.at>
Commit: Martin Rudalics <rudalics@gmx.at>

    Split windows evenly when 'min-margins' parameter was set (Bug#44483)
    
    * lisp/window.el (split-window): Make new window inherit any
    'min-margins' parameter from WINDOW so that horizontal splits
    reliably produce windows of same width (Bug#44483).
---
 lisp/window.el | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/lisp/window.el b/lisp/window.el
index 48005fc..ba56ded 100644
--- a/lisp/window.el
+++ b/lisp/window.el
@@ -5412,7 +5412,13 @@ frame.  The selected window is not changed by this 
function."
              (set-window-parameter (window-parent new) 'window-atom t))
            (set-window-parameter new 'window-atom t)))
 
-         ;; Sanitize sizes unless SIZE was specified.
+          ;; Make the new window inherit the `min-margins' parameter of
+          ;; WINDOW (Bug#44483).
+          (let ((min-margins (window-parameter window 'min-margins)))
+            (when min-margins
+              (set-window-parameter new 'min-margins min-margins)))
+
+          ;; Sanitize sizes unless SIZE was specified.
          (unless size
             (window--sanitize-window-sizes horizontal))