Fwd: Re: flushpage

Putting gs-devel back in the loop.

>Date: Fri, 17 Nov 2017 02:06:53 +0000 (UTC)
>From: Michael K <[email protected]>
>To: Ken Sharp <[email protected]>
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>Subject: Re: [gs-devel] flushpage
>
>The problem with 'showpage' is that it erases the screen which, in my 
>application I do not want.
>
>
>On Thursday, November 16, 2017, 4:30:46 PM EST, Ken Sharp 
><[email protected]> wrote:
>
>
>At 20:44 16/11/2017 +0000, Michael K wrote:
> >It seems that flushpage has been removed or hidden in 9.22.
> >
> >I haven't found any note that says it was removed but it gives an
> >undefined error when using it in 9.22
>
>A number of non-standard PostScriptextension operators were removed from
>Ghostscript as part of a security hardening exercise.
>
>This is mentioned (briefly) in the main points of the 9.22 release and in
>more detail:
>
>2017-05-11 13:09:29 +0100
>Ken Sharp <<mailto:[email protected]>[email protected]>
>1497d65039885a52b598b137dd8622bd4672f9be
>
>     Remove as many non-standard operators as possible
>
>     Remove all the Display PostScript operators and all the NeXT extensions
>
>     Remove all the operators which do not appear to be used in our code
>
>     Remove all the operators which are only used in bound procedures defined
>     at startup and which can therefore subsequently be removed.
>
>     The operators to be undefined are stored in arrays in PostScript and
>     the C support code is untouched. This means that it is relatively
>     simple for an end user to restore an operator if required.
>
>     Operators which are used in our test suite files are listed in the
>     arrays but commented out.
>
>     Operators which are used (by our own code) in a way which requires them
>     to be present are also listed in the arrays, but commented out.
>
>
>
> >What is the way to achieve a flush to the X11 display in 9.22 ?
>
>
>Well I would have thought showpage would work.
>
>
>
>                     Ken
>