[osg-submissions] osgViewer/X11: now really(?) fix capslock

[Melchior FRANZ]

Attached is a fix for remaining problems in capslock handling:
It sets osgGA's keymask when restoring keys on FocusIn, according
to the state values of XKeyEvent and XCrossingEvent. (These are
the only source for X11's current capslock state that avoids
pulling in the XKB extension.)

Files included in the archive:
  ./src/osgViewer/GraphicsWindowX11.cpp
  ./include/osgViewer/api/X11/GraphicsWindowX11

I hope you don't find yet another problem, but I won't hold
my breath. Worked here at least in all my tests.  :-)

m.
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