patch 7.4.1859

Problem:    Cannot use a function reference for "exit_cb".
Solution:   Use get_callback(). (Yegappan Lakshmanan)

patch 7.4.1858

Problem:    When a channel writes to a buffer it doesn't find a buffer by the
            short name but re-uses it anyway.
Solution:   Find buffer also by the short name.

patch 7.4.1857

Problem:    When a channel appends to a buffer that is 'nomodifiable' there is
            an error but appending is done anyway.
Solution:   Add the 'modifiable' option.  Refuse to write to a 'nomodifiable'
            when the value is 1.

patch 7.4.1856

Problem:    failing job test fails on MS-Windows.
Solution:   Expect "fail" status instead of "dead".

patch 7.4.1855

Problem:    Valgrind reports memory leak for job that is not freed.
Solution:   Free all jobs on exit.  Add test for failing job.

patch 7.4.1854

Problem:    When setting 'termguicolors' the Ignore highlighting doesn't work.
            (Charles Campbell)
Solution:   Handle the color names "fg" and "bg" when the GUI isn't running
            and no colors are speficied, fall back to black and white.

patch 7.4.1853

Problem:    Crash when job and channel are in the same dict while using
            partials. (Luc Hermitte)
Solution:   Do not decrement the channel reference count too early.

patch 7.4.1852

Problem:    Unix: Cannot run all tests with the GUI.
Solution:   Add the "testgui" target.

patch 7.4.1851

Problem:    test_syn_attr failes when using the GUI. (Dominique Pelle)
Solution:   Escape the font name properly.

patch 7.4.1850

Problem:    GUI freezes when using a job. (Shougo)
Solution:   Unregister the channel when there is an input error.