ComboBoxElement.getOptions() may return empty array if the values are still being loaded

[mvysny]

combobox-testBench 23.6.0

ComboBoxElement.getOptions() may return empty array if the values are still being loaded. Solution is to wait until Combo is ready.

Fix:

    /**
     * @return true if ComboBox is still loading items and populating its dropdown.
     */
    public boolean isLoading() {
        return getPropertyBoolean("loading");
    }

    /**
     * Wait until ComboBox is finished populating its dropdown.
     */
    public void waitWhileLoading() {
        while (isLoading()) {
            try {
                Thread.sleep(200);
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            }
        }
    }

    @Override
    public List<String> getOptions() {
        // wait until the ComboBox dropdown is populated. Otherwise, we'll get an empty list of options.
        waitWhileLoading();
        return super.getOptions();
    }