[Bug 211922] Marked areas do not get cleared after they get scrolled out of the buffer

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211922

            Bug ID: 211922
           Summary: Marked areas do not get cleared after they get
                    scrolled out of the buffer
           Product: Base System
           Version: 11.0-RC1
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: blachste at b-tu.de
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

When using vt console in text mode, the marked area does not get cleared after
it scrolled out of the buffer.

How to reproduce:
0. % less somelargetextfile
1. Mark some area with the left mouse button.
2. Then press and hold the space bar to quickly scroll. You will see the marked
background color flash up regularly every time the console scroll buffer got
cycled through.
(Or build a kernel or such, you will see this flashing up regularly.

You can verify that by clearing the marked area with a single mouse click -
after that the repeated "flashing" of the former marking is gone.

I am very willing to assist with finding and fixing the problem. So, if you
need any details or more informations, just ask.

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