[osg-submissions] X11WindowingSystemInterface sets X11 error handler

[Colin McDonald]

Hi Robert,

The X11WindowingSystemInterface in osgViewer/GraphicsWindowX11.cpp
unconditionally sets the X11 error handler routine, replacing anything
that was previously set.  This is a bit unfriendly, as the X11 error
handler is a global attribute which the application, or the GUI toolkit
being used, may well have set itself.

So I have modified X11WindowingSystemInterface to only replace the error
handler if it is the default i.e. if the application has not set it.

Regards

Colin McDonald
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