title: Android Studio Focus-Switch to ClassFile
body: <p>in Android Studio I see my classes on the left (Android-Tab) and the editor window with the open class file (SomeClass.java) on the right. </p>
  
  <p>If I double click a class file in the Android-Tab, it gets opened and the focus switches to the class file. I can start writing immediately.</p>
  
  <p>My problem is: If I select a class file in the Android-Tab and hit 'Enter', the class file opens but the focus is still in the Android-Tab and I can not start writing. I have to use the mouse/trackpad to click into the class file to switch the focus. </p>
  
  <p>Is it possible to change the behaviour of Android Studio in that case?</p>
  
  <p>I use Android Studio 2.3 beta 2 on OSX.</p>
  
  <p>Thanks in advance</p>