Problem:    Tabpage option not yet implemented for popup window.
Solution:   Implement tabpage option, also for popup_getoptions().

Problem:    Textprop test fails if screenhots do not work.
Solution:   Add check for screenhots working.

Problem:    Compiler warnings with tiny build. (Tony Mechelynck)
Solution:   Add #ifdef.

Problem:    textprop highlight starts too early if just after a tab.
Solution:   Check if still drawing a previous character. (closes #4558)

Problem:    Icon signs not displayed properly in the number column.
Solution:   Display them properly. (Yegappan Lakshmanan, closes #4559)

Problem:    Cannot build with signs but without diff feature.
Solution:   Move #ifdef. (Tom Ryder)

Problem:    Strftime() test fails on MS-Windows.
Solution:   Skip the check for using the $TZ environment variable.

Problem:    Localtime_r() does not respond to $TZ changes.
Solution:   If $TZ changes then call tzset(). (Tom Ryder)

Problem:    Error message when terminal closes while it is not in the current
            tab.
Solution:   Also set "do_set_w_closing" when using the special autocommand
            window. (closes #4552)

Problem:    MS-Windows: no sound support.
Solution:   Add sound support for MS-Windows. (Yasuhiro Matsumoto, Ken Takata,
            closes #4522)