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I want to use <S-Tab> to do the reverse of <Tab> in insert mode in Lua. (If this is complicated in Lua then VimScript is OK) How?

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Is <C-d> what you want? :h i_CTRL-D

                        *i_CTRL-D*
CTRL-D      Delete one shiftwidth of indent at the start of the current
        line.  The indent is always rounded to a 'shiftwidth' (this is
        vi compatible).

If so

inoremap <S-Tab> <C-d>
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vim.api.nvim_set_keymap('i', '<S-Tab>', "v:lua.check_back_space() ? '<BS>' : '<NOP>'", EXPR_NOREF_NOERR_TRUNC)

where EXPR_... is

local EXPR_NOREF_NOERR_TRUNC = { expr = true, noremap = true, silent = true, nowait = true }

and check_back_space can be implemented easily.

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