odd crash in Font::operator=

[Michael Stahl]

i've had an odd crash in forms_unoapi test yesterday, and can't
reproduce it; from looking at  vcl/source/gdi/font.cxx  it appears that
mpImplFont has been deleted (it can't be 0 apparently).

running the test with VALGRIND=memcheck doesn't give any errors there.
anybody have an idea how that could happen?
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