title: Why performAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS) always return false on editText?
body: <p>I want to clear the input focus from an editText in my accessibility service on a specific action.</p>
  
  <p>I get the node with the input focus and try to clear it but performAction always return false:</p>
  
  <pre><code>AccessibilityNodeInfo root = getRootInActiveWindow();
  AccessibilityNodeInfo focus = root.findFocus(AccessibilityNodeInfo.FOCUS_INPUT);
  
  if(focus != null){
  
      focus.getText(); //return the text in my input
      focus.isFocusable(); //return true
      focus.isFocused(); // return true
      focus.getActions(); //Return the bitmask that contain the Action_clear_focus
  
      boolean sucess = focus.performAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS);
      Log.v(TAG, "sucess = " + sucess); //Always return FALSE
  
  }
  </code></pre>
  
  <p>Why the action cannot be performed?    </p>