title: Firebase Auth UI with Phone issue - missing `layout_width` attribute
body: <p>App crashes with Phone Auth while Google Auth works fine.
  Both Phone Auth and Google Auth are enabled at firebase console.</p>
  <p>Crash Log:</p>
  <pre><code>2022-07-27 10:18:08.847 4454-4454/redacted.com E/AndroidRuntime: FATAL EXCEPTION: main
  Process: redacted.com, PID: 4454
  android.view.InflateException: Binary XML file line #46 in redacted.com:layout/fui_phone_layout: Binary XML file line #46: You must supply a layout_width attribute.
  Caused by: java.lang.UnsupportedOperationException: Binary XML file line #46: You must supply a layout_width attribute.
  </code></pre>
  <p>I'm using the official <a href="https://firebase.google.com/docs/auth/android/firebaseui" rel="nofollow noreferrer">firebase auth ui</a> library without any custom modification. The crash reason is obvious may be from the error but how do I solve this?.</p>
  <pre><code>Line #46 at `fui_phone_layout` layout has missing `layout_width` attribute. 
  </code></pre>
  <p>I have checked the <a href="https://github.com/firebase/FirebaseUI-Android/blob/master/auth/src/main/res/layout/fui_phone_layout.xml" rel="nofollow noreferrer">fui_phone_layout.xml</a> file in official github repository. <code>ConstraintLayout</code> layout at line <code>#20</code> seems to have missing <code>layout_width</code> attribute but the error is telling line <code>#40</code> having the problem.</p>
  <p>Tried creating <code>fui_phone_layout.xml</code> file clone in the project layout folder, but it didn't work.</p>
  <p>Added the missing <code>layout_width</code> attribute for <code>ConstraintLayout</code> which has the missing attribute.</p>
  <p>Project Gradle Config:</p>
  <pre><code>implementation platform('com.google.firebase:firebase-bom:30.3.1')
  implementation 'com.google.firebase:firebase-auth-ktx'
  implementation 'com.google.firebase:firebase-firestore-ktx'
  implementation 'com.firebaseui:firebase-ui-auth:7.2.0'
  </code></pre>
  <p>Auth UI launch code</p>
  <pre><code>val providers = arrayListOf(
                  AuthUI.IdpConfig.GoogleBuilder().build(),
                  AuthUI.IdpConfig.PhoneBuilder().build()
              )
  val signInIntent = AuthUI.getInstance()
                    .createSignInIntentBuilder()
                    .setAvailableProviders(providers)
                    .setLogo(R.drawable.logo) 
                    .setTheme(R.style.MyTheme)
                    .build()
  signInLauncher.launch(signInIntent)
  </code></pre>