Ensure batch edit mode is ended on window focus loss

This is a translation of this open source contribution:
https://android-review.googlesource.com/38503

Change-Id: I4d3adf89d0752e6fd5ec2cdad3a54d4e764a1fe7

core/java/android/widget/Editor.java

@@ -978,8 +978,8 @@ public class Editor {
                 mSuggestionsPopupWindow.onParentLostFocus();
             }
 
-            // Don't leave us in the middle of a batch edit.
-            mTextView.onEndBatchEdit();
+            // Don't leave us in the middle of a batch edit. Same as in onFocusChanged
+            ensureEndedBatchEdit();
         }
     }