`<ESC>[r` shall call `Termbuf.setScrollRegion(0, rows - 1)` as default value, but it calls `Termbuf.setScrollRegion(0, -1)` now due to wrong params parsing.
<ESC>[rshall callTermbuf.setScrollRegion(0, rows - 1)as default value, but it callsTermbuf.setScrollRegion(0, -1)now due to wrong params parsing.