commit (HEAD): Fix crash on synthesized fonts in Unix.

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CVS: ----------------------------------------------------------------------
CVS: Enter Log. Lines beginning with `CVS:' are removed automatically
CVS:
CVS: Committing in .
CVS:
CVS: Modified Files:
CVS: af/gr/unix/gr_UnixGraphics.cpp af/gr/xp/gr_Graphics.cpp
CVS: af/gr/xp/gr_Graphics.h af/xap/unix/xap_UnixFont.cpp
CVS: af/xap/unix/xap_UnixFont.h af/xap/unix/xap_UnixFontManager.cpp
CVS: af/xap/unix/xap_UnixFontManager.h
CVS: ----------------------------------------------------------------------
Fix crash on synthesized fonts.

This shows up if you select Italisized Symbol fonts for example. The crash
also happens in STABLE. This fix should be backported.

The problem is that we cache pointers to fonts in 3 different place in
Unx. in fp_Run, in GR_Graphics and XAP_UnixFontManager. Then if we
synthesisze a font
we no longer need the previously cached version. We can't delete the
pointer because xap_UnixFontManager has no way of getting at what called
it. Instead I keep a copy of the old font in a vector and invalide the
GR_Graphics chache.

Unfortunately I don't know how to invalidate the cache in fp_Run short of
passing a pointer back to fp_Run in the GR_Graphics::setFont method. The
result is that italisized synthesized fonts don;t crash but they look
stupid.

See the attached document for the example. It load fine now.

Martin

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