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When text is loaded into a diagram, and that text happens to be near the end
of the Wimp slot, and there's no intervening 0 byte (Draw text areas use \n as
terminators), then when getting the font size the call to strtod() could abort
in a hidden library call to strlen() when it scans forwards looking for a
terminator. Much of the time you'd get away with it if the previous use of
that page happened to contain a 0 byte.

Play it safe and copy the text to convert to a buffer before using the C
library functions. The conversion buffer is set to be larger than the longest
possible value, rather than clipping the text exactly, so that LONG_MAX and
HUGE_VAL can be returned in the error case.

Version 1.46. Tagged as 'Draw-1_46'