Problem:    Breakindent test fails.
Solution:   Fix condition.

Problem:    Cannot put virtual text after or below a line.
Solution:   Add "text_align" and "text_wrap" arguments.

Problem:    MS-Windows GUI: cannot use AltGr + Space.
Solution:   Check for VK_MENU instead of VK_LMENU. (Anton Sharonov,
            closes #10820, closes #10753)

Problem:    Tiny chance that creating a backup file fails.
Solution:   Check for EEXIST error. (Ken Takata, closes #10821)

Problem:    No test for what patch 9.0.0155 fixes.
Solution:   Add a test. Fix typos.  (closes #10822)

Problem:    Text of removed textprop with text is not freed.
Solution:   Free the text when the property is removed.  Reduce the array size
            to ignore NULLs at the end.

Problem:    Virtual text not displayed if 'signcolumn' is "yes".
Solution:   Set c_extra and c_final to NUL.

Problem:    When 'cmdheight' is zero pressing ':' may scroll a window.
Solution:   Add the made_cmdheight_nonzero flag and set 'scrolloff' to zero.

Problem:    The command line takes up space even when not used.
Solution:   Allow for 'cmdheight' to be set to zero. (Shougo Matsushita,
            closes #10675, closes #940)

Problem:    has() is not strict about parsing the patch version.
Solution:   Check the version more strictly. (Ken Takata, closes #10752)