Do not evaluate when in RESULT state.

Fixes: 35162435
This prevents requireResult from being called a second time (and
duplicating history entries) during a multiwindow change.

Change-Id: I145d4e770c3e5ac8b8554ea1a2a577a34369899d
diff --git a/src/com/android/calculator2/Calculator.java b/src/com/android/calculator2/Calculator.java
index 1516a11..d184344 100644
--- a/src/com/android/calculator2/Calculator.java
+++ b/src/com/android/calculator2/Calculator.java
@@ -918,9 +918,10 @@
 
         mResultText.onEvaluate(index, initDisplayPrec, msd, leastDigPos, truncatedWholeNumber);
         if (mCurrentState != CalculatorState.INPUT) {
-            // In EVALUATE, INIT, or INIT_FOR_RESULT state.
+            // In EVALUATE, INIT, RESULT, or INIT_FOR_RESULT state.
             onResult(mCurrentState == CalculatorState.EVALUATE /* animate */,
-                     mCurrentState == CalculatorState.INIT_FOR_RESULT /* previously preserved */);
+                     mCurrentState == CalculatorState.INIT_FOR_RESULT
+                    || mCurrentState == CalculatorState.RESULT /* previously preserved */);
         }
     }