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5f871007d7
Problem: b_locked_split is not checked for :sbuffer, which allows
autocommands to leave windows open to freed buffers.
Solution: In do_buffer_ext, check just before possibly splitting, after
handling 'switchbuf'. Leave win_split to handle the check for
curbuf. (needed even if curbuf is not the target, as setting
the buffer after splitting may fail) (Sean Dewar)
closes: vim/vim#19096
ac5c8ab6cc
Co-authored-by: Sean Dewar <6256228+seandewar@users.noreply.github.com>