Problem:    Not all tests are executed on Github Actions.
Solution:   Copy "src" to "src2" earlier. Recognize "src2" in a couple more
            places.  Add two tests to the list of flaky tests. (Ken Takata,
            closes #6798)

Problem:    Python: iteration over vim objects fails to keep reference.
Solution:   Keep a reference for the object. (Paul Ollis, closes #6803,
            closes #6806)

Problem:    assert_fails() checks the last error message.
Solution:   Check the first error, it is more relevant.  Fix all the tests
            that rely on the old behavior.

Problem:    Insufficient test coverage for Python.
Solution:   Add more test cases. (Yegappan Lakshmanan, closes #6415)

Problem:    ml_get error when using Python. (Yegappan Lakshmanan)
Solution:   Check the line number is not out of range.  Call "Check" with
            "fromObj" instead of "from".

Problem:    Not enough testing for Python.
Solution:   Add more tests.  Fix uncovered problems. (Yegappan Lakshmanan,
            closes #6392)

Problem:    Python 3 test is old style.
Solution:   Turn into new style test. (Yegappan Lakshmanan, closes #6385)

Problem:    Heredoc in scripts does not accept lower case marker.
Solution:   Allow lower case only in non-Vim scripts. (Ken Takata,
            closes #6019)

Problem:    Heredoc for interfaces does not support "trim".
Solution:   Update the script heredoc support to be same as the :let command.
            (Yegappan Lakshmanan, closes #5916)

Problem:    Not all code for options is tested.
Solution:   Add more tests. (Yegappan Lakshmanan, closes #5913)