API 28: Show Soft Keyboard When Activities no longer receive focus

https://developer.android.com/about/versions/pie/android-9.0-changes-28#focus

Additionally, activities no longer implicitly assign initial focus in touch-mode. Instead, it is up to you to explicitly request initial focus, if desired.

When entering the password, creating groups, forums or writing blog posts, the keyboard is shown initially, because the input fields receive focus. On API 28, we can't rely on this anymore and should use explicit keyboard states instead.