vim9script

def HighlightedYank(hlgroup = 'IncSearch', duration = 300)
    if v:event.operator ==? 'y'
        var [beg, end] = [getpos("'["), getpos("']")]
        var type = v:event.regtype ?? 'v'
        var pos = getregionpos(beg, end, {type: type})
        var end_offset = (type == 'V' || v:event.inclusive) ? 1 : 0
        var m = matchaddpos(hlgroup, pos->mapnew((_, v) => {
            var col_beg = v[0][2] + v[0][3]
            var col_end = v[1][2] + v[1][3] + end_offset
            return [v[0][1], col_beg, col_end - col_beg]
        }))
        var winid = win_getid()
        timer_start(duration, (_) => m->matchdelete(winid))
    endif
enddef
autocmd TextYankPost * HighlightedYank()