When autoselect gets a small or header selection, try to extend

[ianb]

There's a bunch of cases where an element is very short and unlikely to be interesting enough to capture. Headers are a common example, and even when they are tall enough headers are almost always boring on their own.

When this happens I think we should try to find the next sibling (element not text of course) and add that to the selection.

Note it just has to be an improvement, it doesn't have to be perfect.