patch 8.2.4166: undo synced when switching buffer in another window Commit: https://github.com/vim/vim/commit/e615db06046312e74886fa1ef98feb5a9db2a7c3 Author: Bram Moolenaar <Bram@vim.org> Date: Thu Jan 20 21:00:54 2022 +0000 patch 8.2.4166: undo synced when switching buffer in another window Problem: Undo synced when switching buffer in another window. Solution: Do not sync undo when not needed. (closes https://github.com/vim/vim/issues/9575)

/* vi:set ts=8 sts=4 sw=4 noet:
 *
 * VIM - Vi IMproved	by Bram Moolenaar
 *
 * Do ":help uganda"  in Vim to read copying and usage conditions.
 * Do ":help credits" in Vim to see a list of people who contributed.
 */

#ifdef __QNXNTO__
# include <sys/procmgr.h>
#endif

#define	USE_TMPNAM

#define POSIX	    // Used by pty.c

#if defined(FEAT_GUI_PHOTON)
extern int is_photon_available;
#endif