patch 8.0.0402: :map completion does not have <special>

Problem:    :map completion does not have <special>. (Dominique Pelle)
Solution:   Recognize <special> in completion.  Add a test.

patch 8.0.0401: test fails with missing balloon feature

Problem:    Test fails with missing balloon feature.
Solution:   Add check for balloon feature.

patch 8.0.0400: some tests have a one second delay

Problem:    Some tests have a one second delay.
Solution:   Add --not-a-term in RunVim().

patch 8.0.0399: crash when using balloon_show() when not supported

Problem:    Crash when using balloon_show() when not supported. (Hirohito
            Higashi)
Solution:   Check for balloonEval not to be NULL. (Ken Takata)

patch 8.0.0398: illegal memory access with "t"

Problem:    Illegal memory access with "t".
Solution:   Use strncmp() instead of memcmp(). (Dominique Pelle, closes vim#1528)

patch 8.0.0397: can't build with +viminfo but without +eval

Problem:    Cannot build with the viminfo feature but without the eval
            feature.
Solution:   Adjust #ifdef. (John Marriott)

patch 8.0.0396: 'balloonexpr' only works synchronously

Problem:    'balloonexpr' only works synchronously.
Solution:   Add balloon_show(). (Jusufadis Bakamovic, closes vim#1449)

patch 8.0.0395: testing the + register fails with Motif

Problem:    Testing the + register fails with Motif.
Solution:   Also ignore the "failed to create input context" error in the
            second gvim.  Don't use msg() when it would result in a dialog.

patch 8.0.0394: tabs are not aligned when scrolling horizontally

Problem:    Tabs are not aligned when scrolling horizontally and a Tab doesn't
            fit. (Axel Bender)
Solution:   Handle a Tab as a not fitting character. (Christian Brabandt)
            Also fix that ":redraw" does not scroll horizontally to show the
            cursor.  And fix the test that depended on the old behavior.

patch 8.0.0393: order of duplicate tags is not preserved

Problem:    When the same tag appears more than once, the order is
            unpredictable. (Charles Campbell)
Solution:   Besides using a dict for finding duplicates, use a grow array for
            keeping the tags in sequence.