QSelect Example: Autoselect the first option upon user input

[braden-w]

I was wondering if we could add an example on the docs for a QSelect that autoselects the first option upon user input. Specifically, adding the following code from this StackOverflow post:

(ref) => {
    ref.setOptionIndex(-1);
    ref.moveOptionSelection(1, true);
}

such that the code in the BasicFiltering example is changed from:

      filterFn (val, update, abort) {
        update(() => {
          const needle = val.toLowerCase()
          options.value = stringOptions.filter(v => v.toLowerCase().indexOf(needle) > -1)
        })
      }

to

filterFn (val, update, abort) {
    update(() => {
        const needle = val.toLowerCase()
            options.value = stringOptions.filter(v => v.toLowerCase().indexOf(needle) > -1)
        },
        (ref) => {
            ref.setOptionIndex(-1);
            ref.moveOptionSelection(1, true);
        }
    )
}

alternatively, we could make this a separate example that comes right after the BasicFiltering example!