[Bug 14749] New: riched20: Fix vertical scrolling

http://bugs.winehq.org/show_bug.cgi?id=14749

Summary: riched20: Fix vertical scrolling
           Product: Wine
           Version: CVS/GIT
          Platform: Other
        OS/Version: other
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: comctl32
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

Created an attachment (id=15248)
 --> (http://bugs.winehq.org/attachment.cgi?id=15248)
riched20: Fix vertical scrolling

The acfb6ea210c92ef9ff41dc6828f9482e9c6d6516 commit introduced new bug, that
can be reproduced by any program that uses RichEd20: if control has less than
one page of text, it can be scrolled past the last line of text, hiding all of
it completely.
The following patch fixes this.