Merge "docs: Added desc. of launcher app criteria in Q" into qt-dev

     * {@link Intent#CATEGORY_LAUNCHER}, for a specified user. Result may include

     * synthesized activities like app details Activity injected by system.

     *

     * <p>As of <a href="/reference/android/os/Build.VERSION_CODES.html#Q">Android Q</a>, the

     * launchable activities for a given app are included in the returned list unless the app

     * satisfies at least one of the following conditions:</p>

     * <ul>

     * <li>The app is a system app.</li>

     * <li>The app doesn't declare any <a href="/guide/topics/permissions/overview">permissions</a>.

     * </li>

     * <li>The <code>&lt;application&gt;</code> tag in the app's manifest file doesn't contain any

     * child elements that represent

     * <a href="/guide/components/fundamentals#DeclaringComponents">app components</a>.</li>

     * </ul>

     *

     * @param packageName The specific package to query. If null, it checks all installed packages

     *            in the profile.

     * @param user The UserHandle of the profile.