Fixed cast exception with selectable text.

Bug 6550358

The EditText constructor now calls setTextIsSelectable, which uses
getText where the cast exception happens because the EditText is not
yet fully built and its text does not have the right type.

Fixed by using mText directly instead of getText().

Change-Id: I52a2720ae99475881f210ac74464728cab92147e

Author: Gilles Debunne

core/java/android/widget/TextView.java

@@ -4656,7 +4656,7 @@ public void setTextIsSelectable(boolean selectable) {
         // mInputType should already be EditorInfo.TYPE_NULL and mInput should be null
 
         setMovementMethod(selectable ? ArrowKeyMovementMethod.getInstance() : null);
-        setText(getText(), selectable ? BufferType.SPANNABLE : BufferType.NORMAL);
+        setText(mText, selectable ? BufferType.SPANNABLE : BufferType.NORMAL);
 
         // Called by setText above, but safer in case of future code changes
         mEditor.prepareCursorControllers();