This CL also cleans up and fixes the edit text background setting logic - when the edit text is an autocomplete text view and provides its own background, we won't override the background by trying to add ripples to it.
Later they should be split again from the main class with other box-background-relevant logic.
Resolves https://github.com/material-components/material-components-android/issues/1431
PiperOrigin-RevId: 445486075
Focusing on the layout will let user type, while the arrow icon is what will trigger showing/hiding the dropdown list (which gains focus automatically).
PiperOrigin-RevId: 322846934
The alternative to android:editable="false" (which is deprecated) is to set inputType="none", however due to a framework bug that has no effect. This change makes it so it works as expected.
PiperOrigin-RevId: 299411110
