- highlight support - add option g:dumbbuf_single_key_echo_stack,   g:dumbbuf_hl_cursorline,   g:dumbbuf_remove_marked_when_close. - change g:dumbbuf_disp_expr’s spec. - fix minor bugs and do some optimizations. - replace the words ’select’ to ‘mark’ in document and source code.   I would use ’select’ for only visual mode’s region.

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