QSelect: Add prop to disable keyboard navigation

[abethke-woodport]

Hi,
I'm working on an app that is incredibly heavy on forms, particularly selects/dropdowns. Because of the way my options are formatted, the default QSelect keyboard navigation works very poorly. Because of this issue, I would like a way to disable the default QSelect keyboard navigation.

For example, my options might look something like this:

• Short name (Longer description)
• ABC (Description and other information)
• DEF (Description)

My users' expectation is that if they click on a dropdown and type "def," they'll get the option that starts with those letters. By default, though, the QSelect will select ABC, since the letters d, e, and f are all included in the full option label.

It is already possible to override this by listening to the keydown event, and that's what I did, but this isn't a perfect solution. The default QSelect listener is still running, and sometimes ends up throwing errors for reasons I haven't fully investigated; I assume it has something to do with my listener changing the selected option while it's running. Allowing the default keyboard navigation to be disabled (or, I suppose, overridden more directly) would alleviate this problem.