Problem:    Output of :marks is too short with multi-byte chars. (Tony
            Mechelynck)
Solution:   Get more bytes from the text line.

Problem:    The jumplist is not always properly cleaned up.
Solution:   Call fname2fnum() before cleanup_jumplist(). (Yegappan Lakshmanan)

Problem:    Getjumplist() returns duplicate entries. (lacygoill)
Solution:   Call cleanup_jumplist(). (Yegappan Lakshmanan)

Problem:    Clearing a pointer takes two lines.
Solution:   Add VIM_CLEAR() and replace vim_clear(). (Hirohito Higashi,
            closes #2629)

Problem:    FEAT_WINDOWS adds a lot of #ifdefs while it is nearly always
            enabled and only adds 7% to the binary size of the tiny build.
Solution:   Graduate FEAT_WINDOWS.

Problem:    Terminal buffers are stored in the viminfo file while they can't
            be useful.
Solution:   Skip terminal buffers for file marks and buffer list

Problem:    There are still a few macros that should be all-caps.
Solution:   Make a few more macros all-caps.

Problem:    Using :move messes up manual folds.
Solution:   Split adjusting marks and folds.  Add foldMoveRange(). (neovim
            patch #6221)

Problem:    Some macros are in lower case.
Solution:   Make a few more macros upper case. Avoid lower case macros use an
            argument twice.

Problem:    Some macros are in lower case, which can be confusing.
Solution:   Make a few lower case macros upper case.