Fix error overwriting when restoring error

onRestoreInstanceState restores the old error, after layout has been
done. A new error may have been set before this is done, which thus
overwrites the new error.

This patch prevents the new error from being overwritten.

Change-Id: I8e7c91b5da27310fb6698e671d1f7d78ee268061

core/java/android/widget/TextView.java

@@ -3809,7 +3809,9 @@ public class TextView extends View implements ViewTreeObserver.OnPreDrawListener
             // Display the error later, after the first layout pass
             post(new Runnable() {
                 public void run() {
-                    setError(error);
+                    if (mEditor == null || !mEditor.mErrorWasChanged) {
+                        setError(error);
+                    }
                 }
             });
         }