Fix of CVE: CVE-2022-0351, CVE-2022-0368, CVE-2022-0359, CVE-2022-0361

CVE-2022-0351: fix crash caused by too depth recursion - CVE-2022-0359: fix illegal memory access with large tabstop in ex mode - CVE-2022-0361: fix illegal memory access when copying lines in visual mode - CVE-2022-0368: fix illegal memory access when undo makes visual area invalid...