[Rd] text() with large cex parameter crashes X11() (PR#553)

[Martyn Plummer]

Well, I wasn't wrong. Here's R with DEBUG_X11 switched on

> plot(1,1,type="n")
loading:
-*-helvetica-medium-r-*-*-12-*-*-*-*-*-*-*
success
> points(1,1,pch="A", cex=10)
loading:
-*-helvetica-medium-r-*-*-120-*-*-*-*-*-*-*
failure
loading:
-*-helvetica-medium-r-*-*-34-*-*-*-*-*-*-*
failure

Program received signal SIGSEGV, Segmentation fault.
0x8126336 in SetFont (face=1, size=120, dd=0x8251168) at devX11.c:940
940             XSetFont(display, xd->wgc, xd->font->fid);
(gdb) p xd->font
$1 = (XFontStruct *) 0x0

RLoadFont ignores the fact that it has failed to load a font
and returns a null pointer. 

If this works for you it is perhaps because you have the size 34 font
(the last resort) on your system.

R-devel gives the same result.

Martyn
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