Re-disable drag and drop in full screen extracted mode.

Drag and drop in full screen extracted mode was disabled by
Ifff4c30919bcb04f7d and re-enabled by I90d8e9f42f395b6b52.
However, related issues have not been fixed. This CL re-disables it.

Bug: 22440907
Change-Id: I753f69e170aa7e79478a5a4a3b89e4a7ef88c9e2

core/java/android/widget/Editor.java

@@ -1081,6 +1081,10 @@ public class Editor {
     }
 
     private void startDragAndDrop() {
+        // TODO: Fix drag and drop in full screen extracted mode.
+        if (mTextView.isInExtractedMode()) {
+            return;
+        }
         final int start = mTextView.getSelectionStart();
         final int end = mTextView.getSelectionEnd();
         CharSequence selectedText = mTextView.getTransformedText(start, end);