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

Problem:    Invalid memory access with invalid modeline.
Solution:   Pass pointer limit. Add a test. (closes #3241)

Problem:    'viminfofile' option does not behave like a file name.
Solution:   Add the P_EXPAND flag. (closes #3178)

Problem:    Using dict_add_nr_str() is clumsy.
Solution:   Split into two functions. (Ozaki Kiichi, closes #3154)

Problem:    Negative value of 'softtabstop' not used correctly.
Solution:   Use get_sts_value(). (Tom Ryder)

Problem:    Various problems with 'vartabstop'.
Solution:   Fix memory leak.  Fix crash. Add a few more tests. (Christian
            Brabandt, closes #3076)

Problem:    MS-Windows: colors are wrong after setting 'notgc'.
Solution:   Only call control_console_color_rgb() for the win32 terminal.
            (Nobuhiro Takasaki, closes #3107)

Problem:    Confusing variable name.
Solution:   Rename new_ts to new_vts_array.  Change zero to NULL.

Problem:    Python: getting buffer option clears message. (Jacob Niehus)
Solution:   Don't use aucmd_prepbuf(). (closes #3079)

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