[Gmat-svn] Updates to TrajPlotCanvaas for Linux multiple plots

[Darrel J. C. <gm...@th...>]

    gui/plot/TrajPlotCanvas.*

These updates fix the OpenGL plot bug when more than one plot window is 
created on Linux.

The GTK implementation of OpenGL posts a size event before the window is 
ever opened.  GMAT's OnTrajSize method handles this event, and attempts 
to call glViewport.  However, since the viewport has not been 
initialized at this point, that call fails in the OpenGL libraries, 
terminating GMAT.

I added a GTK specific flag so that size events are not handled until 
after the first call into the OnPaint method.  At that point the GL 
components have been initialized and drawn on screen, so it is then safe 
to handle sizing events.

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GMAT Architectural Design, Linux Development and Test Team

Darrel J. Conway, Ph.D.      Thinking Systems, Inc.
Senior Scientist and CEO     6441 N Camino Libby
Phone: (623) 298-4530        Tucson, AZ 85718
FAX:   (520) 232-2533        www.thinksysinc.com
djc_at_thinksysinc_dot_com
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