bug#20802: Segfault when showing non-GTK+ tooltip

[martin rudalics]

> Thanks.  Now I know why this cannot be reproduced on Windows: this is
> bug#17524 coming back to haunt us.  That bug was reported on Windows,
> I fixed it on Windows, then suggested a similar fix for X, but was
> told it didn't help there.
>
> So now please try making a fix on X similar to commit ebdc80316, and
> if that indeed doesn't help with this crash, perhaps some simple
> variation of that will.

Sorry.  I must be missing something very elementary here.  Your "shadow"
refcounts

#ifdef GLYPH_DEBUG
static int image_cache_refcount, dpyinfo_refcount;
#endif

are defined iff you have GLYPH_DEBUG defined.  How are these supposed to
work when GLYPH_DEBUG is not defined?

martin