Zoom GUI in fltk backend

[John W. Eaton]

On 24-Jul-2009, Shai Ayal wrote:

| On Thu, Jul 23, 2009 at 11:03 PM, John W. Eaton<jwe at octave.org> wrote:
| > On 23-Jul-2009, Shai Ayal wrote:
| >
| > | Did rectangle zoom it work for you before the change?
| >
| > No, I seem to remember similar problems in the past, but I didn't
| > report them because I wasn't sure what was supposed to be happening.
| 
| A possible remedy could be setting the GL_SWAP_TYPE environment
| variable to COPY.

Yes, that makes it work for me, though not very smoothly.  I assume
the poor performance is a graphics card/driver issue.

jwe