[Dillo-dev] text selection and images

I wrote:

I think this may be a different problem, but I discovered that moving the mouse about a lot while selecting text (I think it helps if the page is shorter than the viewport) can get: [...]

The valgrind complaints go away if we check the case where we're in the space following the word specially. I'm guessing that the nextGlyph() loop happens to 'work' but shouldn't.