Library used: com.android.support:design
Version used: 22.2.1
Theme used: Theme.AppCompat.Light.NoActionBar
Devices/Android versions reproduced on: Nexus 5, Version 4.4.2

When I wrap my EditText in a TextInputLayout, the hint no longer supports RTL.

Here is my xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">

<android.support.design.widget.TextInputLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">

<EditText
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="start"
android:hint="Foo"
android:textAlignment="viewStart"/>
</android.support.design.widget.TextInputLayout>

<EditText
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="start"
android:hint="Foo"
android:textAlignment="viewStart"/>
</LinearLayout>

I've attached screenshots for what it looks like on my device

(FYI, adding the attributes on the android.support.design.widget.TextInputLayout tag also doesn't work. I tried)