Overview:
---------
Collaboration diagramms which have both a width larger than maxWidth AND an  
height larger than maxHeight exceed the page border if width/maxWidth is less than height/maxHeight.

Patch:
------

in src/dot.cpp:2020
in function QCString DotClassGraph::writeGraph(...)

instead of:

      if (width>maxWidth)
      {
        out << "\\includegraphics[width=" << maxWidth << "pt]";
      }
      else if (height>maxHeight)
      {
        out << "\\includegraphics[height=" << maxHeight << "pt]";
      }
      else
      {
        out << "\\includegraphics[width=" << width << "pt]";
      }

write this:

      if ( (width>maxWidth) || (height>maxHeight) )
      {
	if ( (float)width/(float)maxWidth > (float)height/(float)maxHeight )
	{
	  out << "\\includegraphics[width=" << maxWidth << "pt]";
	}
	else
	{
	  out << "\\includegraphics[height=" << maxHeight << "pt]";
	}
      }
      else
      {
	out << "\\includegraphics[width=" << width << "pt]";
      }