[Dillo-dev] dillo fltk-1.3 scroll bar delay

I'm not too clear on what you might be seeing, but I just pushed a change that fixes _my_ main problem with the scrollbars, and maybe they're the same thing. There's still the issue that we send events to the scrollbars when they're hidden. We could check visible(), but perhaps Johannes would prefer to do some more battle with the resizing instead.