On Emacs Windows It seems like the observation of https://lists.libreplanet.org/archive/html/help-gnu-emacs/2023-11/msg00109.html has never been reported as a bug. This issue is real. When I spilt a Windows with C-x 3 and save the desktop and re-open the desktop, the scrollbar separating the two windows is broader than it used to be before saving. When I manually open the .emacs.desktop file and delete the setq scroll-bar-width and reload the desktop, the width is back to normal.