Problem:    Various typos in source files and tests.
Solution:   Fix the typos. (Emir Sari, closes #5532)

Problem:    Using old C style comments.
Solution:   Use // comments where appropriate.

Problem:    GUI: when losing focus a pending operator is executed.
Solution:   Do not execute an operator when getting K_IGNORE. (closes #5300)

Problem:    Debugging where a delay comes from is not easy.
Solution:   Use different values when calling ui_delay().

Problem:    'showbreak' cannot be set for one window.
Solution:   Make 'showbreak' global-local.

Problem:    Mode() result after usign "r" depends on whether CURSOR_SHAPE is
            defined. (Christian Brabandt)
Solution:   Move the #ifdef to only skip ui_cursor_shape().

Problem:    Cannot get the Vim command line arguments.
Solution:   Add v:argv. (Dmitri Vereshchagin, closes #1322)

Problem:    Not easy to move to the middle of a text line.
Solution:   Add the gM command. (Yasuhiro Matsumoto, closes #2070)

Problem:    Searchit() has too many arguments.
Solution:   Move optional arguments to a struct.  Add the "wrapped" argument.

Problem:    Mouse support not always available.
Solution:   Enable mouse support also in tiny version.  Do not define
            FEAT_MOUSE_XTERM on MS-Windows (didn't really work).