patch 8.0.1428: compiler warning on 64 bit MS-Windows system

Problem:    Compiler warning on 64 bit MS-Windows system.
Solution:   Change type from "int" to "size_t". (Mike Williams)

patch 8.0.1427: the :leftabove modifier doesn't work for :copen

Problem:    The :leftabove modifier doesn't work for :copen.
Solution:   Respect the split modifier. (Yegappan Lakshmanan, closes vim#2496)

patch 8.0.1426: "gf" and <cfile> don't accept ? and & in URL

Problem:    "gf" and <cfile> don't accept ? and & in URL. (Dmitrii Tcyganok)
Solution:   Check for a URL and allow for extra characters. (closes vim#2493)

patch 8.0.1425: execute() does not work in completion of user command

Problem:    execute() does not work in completion of user command. (thinca)
Solution:   Switch off redir_off and restore it. (Ozaki Kiichi, closes vim#2492)

patch 8.0.1424: the timer_pause test is flaky on Travis

Problem:    The timer_pause test is flaky on Travis.
Solution:   Accept a longer sleep time on Mac.

patch 8.0.1423: error in return not caught by try/catch

Problem:    Error in return not caught by try/catch.
Solution:   Call update_force_abort(). (Yasuhiro Matsomoto, closes vim#2483)

patch 8.0.1422: no fallback to underline when undercurl is not set

Problem:    No fallback to underline when undercurl is not set. (Ben Jackson)
Solution:   Check for the value to be empty instead of NULL. (closes vim#2424)

patch 8.0.1421: accessing invalid memory with overlong byte sequence

Problem:    Accessing invalid memory with overlong byte sequence.
Solution:   Check for NUL character. (test by Dominique Pelle, closes vim#2485)

patch 8.0.1420: accessing freed memory in vimgrep

Problem:    Accessing freed memory in vimgrep.
Solution:   Check that the quickfix list is still valid. (Yegappan Lakshmanan,
            closes vim#2474)

patch 8.0.1419: cursor column is not updated after ]s

Problem:    Cursor column is not updated after ]s. (Gary Johnson)
Solution:   Set the curswant flag.