riched20: Prevent setting an invalid default format rect

[Thomas Faber]

Hey,

On 2011-10-15 12:10, Thomas Faber wrote:
> The patch fixes this by adding checks to ME_SetDefaultFormatRect to
> use the minimal rectangle that is still valid in this case.

I've made some tests (will post them later) and it turns out this rectangle
is also invalid in Windows in this case, so this is not the correct
solution.
Please ignore the patch, I will try to come up with a better one soon.

Regards,
Tom