Problem:    Crash when a callback deletes a window that is being used.
Solution:   Do not unload a buffer that is being displayed while redrawing the
            screen. Also avoid invoking callbacks while redrawing.
            (closes #2107)

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

Problem:    Plural messages are not translated properly.
Solution:   Add more usage of NGETTEXT(). (Sergey Alyoshin)

Problem:    File type checking has too many #ifdef.
Solution:   Always define the S_IF macros. (Ken Takata, closes #3306)

Problem:    Saving and restoring window title does not always work.
Solution:   Use the stack push and pop commands. (Kouichi Iwamoto,
            closes #3059)

Problem:    g:actual_curbuf set in wrong scope. (Daniel Hahler)
Solution:   Prepend the "g:" name space. (closes #3279)

Problem:    Directly checking 'buftype' value.
Solution:   Add the bt_normal() function. (Yegappan Lakshmanan)

Problem:    All tab stops are the same.
Solution:   Add the variable tabstop feature. (Christian Brabandt,
            closes #2711)

Problem:    Window title is wrong after resetting and setting 'title'.
Solution:   Move resetting the title into maketitle(). (Jason Franklin)

Problem:    Not restoring Insert mode if leaving a prompt buffer by using a
            mouse click.
Solution:   Set b_prompt_insert appropriately. Also correct cursor position
            when moving cursor to last line.