Problem:    Strings in swap file may not be NUL terminated. (Coverity)
Solution:   Limit the length of the used string.

Problem:    Build failure without the +eval feature. (Brenton Horne)
Solution:   Add #ifdef.  Also add the "dirty" item.

Problem:    Information about a swap file is unavailable.
Solution:   Add swapinfo(). (Enzo Ferber)

Problem:    File info message not always suppressed with 'F' in 'shortmess'.
            (Asheq Imran)
Solution:   Save and restore msg_silent. (Christian Brabandt, closes #3221)

Problem:    line2byte() is wrong for last line with 'noeol' and 'nofixeol'.
Solution:   Fix off-by-one error. (Shane Harper, closes #3351)

Problem:    Using a full path is supported for 'directory' but not for
            'backupdir'. (Mikolaj Machowski)
Solution:   Support 'backupdir' as well. (Christian Brabandt, closes #179)

Problem:    gcc 8.1 warns for use of strncpy(). (John Marriott)
Solution:   Use mch_memmove() instead of STRNCPY().

Problem:    Swap file warning for a file in a non-existing directory, if there
            is another with the same file name. (Juergen Weigert)
Solution:   When expanding the file name fails compare the file names.

Problem:    Some macros are used without a semicolon, causing auto-indent to be
            wrong.
Solution:   Use the do-while(0) trick. (Ozaki Kiichi, closes #2729)

Problem:    Too many #ifdefs.
Solution:   Graduate the +autocmd feature. Takes away 450 #ifdefs and
            increases code size of tiny Vim by only 40 Kbyte.