Fix for segmentation fault in stage with intel graphic boards

Hi,

we had the reproducible problem, that stage crashed on four of five
startups just after the simulation window appears. We noticed this problem
on several Ubuntu 9.10 machines with attached intel graphic hardware. We
tested the trunk and 3.2.2 version with the same result. The problem did  
not occur on machines with NVIDIA graphic boards.

It seems that if Canvas::Resize() is called rather than Canvas::InitGl(),
the intel driver produces a segmentation fault in the function
glLoadIdentity() called by Canvas::FixViewport().

The following patch should fix this problem:

--- libstage/canvas.cc	(Revision 8612)
+++ libstage/canvas.cc	(Arbeitskopie)
@@ -1285,6 +1285,7 @@
  void Canvas::resize(int X,int Y,int W,int H)
  {
    Fl_Gl_Window::resize(X,Y,W,H);
-  FixViewport(W,H);
+  if ( init_done )
+	  FixViewport(W,H);
    invalidate();
  }


Regards
Daniel

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