BLN_NOOPT (reference) in projects: vim-8.2.3635

955 #define BLN_NOOPT	16	// don't copy options to existing buffer  macro

4191     bufnr = buflist_add(fname, BLN_LISTED | BLN_NOOPT);  in handle_drop_command()

12407 Solution:   Add BLN_NOOPT.  Don't call buf_valid() in buf_copy_options().

/vim-8.2.3635/src/
H A D	vim.h	`955 #define BLN_NOOPT 16 // don't copy options to existing buffer macro`
H A D	buffer.c	`2006 if ((flags & BLN_NOOPT) == 0) in buflist_new()`
H A D	terminal.c	`4191 bufnr = buflist_add(fname, BLN_LISTED \| BLN_NOOPT); in handle_drop_command()`
H A D	quickfix.c	`2426 buf = buflist_new(bufname, NULL, (linenr_T)0, BLN_NOOPT); in qf_get_fnum()`
/vim-8.2.3635/runtime/doc/
H A D	version8.txt	`12407 Solution: Add BLN_NOOPT. Don't call buf_valid() in buf_copy_options().`