title: What is LinearLayoutCompat in appCompat v7?
body: <p>In the support library appCompat v7 of the Android platform, there is a <a href="http://developer.android.com/reference/android/support/v7/widget/LinearLayoutCompat.html">android.support.v7.widget.LinearLayoutCompat</a> class.</p>
  
  <p>Does someone know why this class exist? The original LinearLayout class exist since API level 1 so I don't understand why there is a compat version.</p>