patch 8.0.1227: undefined left shift in readfile()

Problem:    Undefined left shift in readfile(). (Brian 'geeknik' Carpenter)
Solution:   Add cast to unsigned. (Dominique Pelle, closes vim#2253)

patch 8.0.1226: edit and popup tests failing

Problem:    Edit and popup tests failing.
Solution:   Make the tests pass.

patch 8.0.1225: no check for spell region being zero

Problem:    No check for spell region being zero. (geeknik)
Solution:   Check for zero. (closes vim#2252)

patch 8.0.1224: still interference between test functions

Problem:    Still interference between test functions.
Solution:   Clear autocommands. Wipe all buffers.  Fix tests that depend on a
            specific start context.

patch 8.0.1223: crash when using autocomplete and tab pages

Problem:    Crash when using autocomplete and tab pages.
Solution:   Check if the current tab changed. (Christian Brabandt, closes
            vim#2239)

patch 8.0.1222: test functions interfere with each other

Problem:    Test functions interfere with each other.
Solution:   Cleanup tab pages, windows and buffers.  Reset option.

patch 8.0.1221: still too many old style tests

Problem:    Still too many old style tests.
Solution:   Convert a few more tests to new style. (Yegappan Lakshmanan,
            closes vim#2256)

patch 8.0.1220: skipping empty statusline groups is not correct

Problem:    Skipping empty statusline groups is not correct.
Solution:   Also set group_end_userhl. (itchyny)

patch 8.0.1219: terminal test is flaky

Problem:    Terminal test is flaky.
Solution:   Add test function to list of flaky tests.

patch 8.0.1218: writing to freed memory in autocmd

Problem:    Writing to freed memory in autocmd.
Solution:   Make a copy of the tag line. (Dominique Pelle, closes vim#2245)