Take optional fields into consideration when measuring

Also, move the padding to the icon so it's not dependent on an optional
view.

Bug: 123378871
Test: Do not set subtitle/description. Dialog layout looks normal now.
Change-Id: Ia6ae768660442aeaadeb09aa7117780b8a97d56f

packages/SystemUI/res/layout/auth_biometric_contents.xml

@@ -42,7 +42,6 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:paddingHorizontal="24dp"
-        android:paddingBottom="48dp"
         android:paddingTop="8dp"
         android:gravity="@integer/biometric_dialog_text_gravity"
         android:textSize="16sp"
@@ -52,6 +51,7 @@
         android:id="@+id/biometric_icon"
         android:layout_width="@dimen/biometric_dialog_biometric_icon_size"
         android:layout_height="@dimen/biometric_dialog_biometric_icon_size"
+        android:paddingTop="48dp"
         android:layout_gravity="center_horizontal"
         android:scaleType="fitXY" />
 

packages/SystemUI/src/com/android/systemui/biometrics/AuthBiometricView.java

@@ -608,7 +608,10 @@ public abstract class AuthBiometricView extends LinearLayout {
                         MeasureSpec.makeMeasureSpec(newWidth, MeasureSpec.EXACTLY),
                         MeasureSpec.makeMeasureSpec(height, MeasureSpec.AT_MOST));
             }
-            totalHeight += child.getMeasuredHeight();
+
+            if (child.getVisibility() != View.GONE) {
+                totalHeight += child.getMeasuredHeight();
+            }
         }
 
         // Use the new width so it's centered horizontally