[Bug 231301] print/gv: unusable due to distorted non-refresh screen after page change

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231301

            Bug ID: 231301
           Summary: print/gv: unusable due to distorted non-refresh screen
                    after page change
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs at FreeBSD.org
          Reporter: ohartmann at walstatt.org

Running OS: FreeBSD 12-ALPHA5 (12.0-ALPHA5 #123 r338586: Tue Sep 11 14:41:27
CEST 2018 amd64), ports tree at Revision: 479524, all ports up to date so far
including recent ghostscript updates.

Phenomenon: Creating a Postscript document via LaTeX (print/texlive-full, 2015)
and trying to display the result via print/gv results in a complete wrecked
view on the document when moving from one page to another, either forward or
backward. It looks to me like the content of the previous shown page of the PS
document is not cleared and the content of the new page is simply printed over
the old page. After paging forward and backward a couple of pages, the whole
content displayed via gv is not readable any more. A kind of refresh with the
expected clearing of the previous page's content can be forced by refitting the
page to anything provided by the menu of gv.

The same happens if the document is compiled by LaTeX/pdflatex as PDF and tried
to be shown/displayed via gv.

The problem also occurs with commercial PDF's (books), which has been displayed
so far without problems via gv - until recently.

I have, so far, recompiled all requisites of print/gv and most parts of the X11
system, but with no success. I also deleted the local config file, ~/.gv, and
the global one and left the system with the defaults after reinstallation -
without any success. 

I can not say whether this is a FreeBSD ports specific problem or a general bug
in print/gv occuring with recent changes to ghostscript.

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