CVE-2022-2124: fix out-of-bounds read in current_quote() when searching for
quotes goes over the end of the line (textobject.c, upstream patch 8.2.5120)
CVE-2022-2126: fix invalid index use in suggesttriewalk() when ts_fidx
is zero (spellsuggest.c, upstream patch 8.2.5123)
CVE-2022-2207: fix read before start of line with BS in Replace mode
(edit.c, upstream patch 8.2.5162)
CVE-2022-1720: fix read past end of line with "gf" in Visual block mode
(normal.c, upstream patch 8.2.4956)
CVE-2022-2042: fix uninitialized value and use-after-free in spell command
(spell.c, upstream patch 8.2.5072)