CreateSwitchIntention: disable in assignment (while valid, rarely makes sense -- see IDEA-206725)

java/java-impl/src/com/intellij/codeInsight/intention/impl/CreateSwitchIntention.java

@@ -53,6 +53,7 @@ public class CreateSwitchIntention extends BaseElementAtCaretIntentionAction imp
     PsiExpressionStatement expressionStatement = PsiTreeUtil.getParentOfType(element, PsiExpressionStatement.class, false);
     return expressionStatement != null &&
            expressionStatement.getParent() instanceof PsiCodeBlock &&
+           !(expressionStatement.getExpression() instanceof PsiAssignmentExpression) &&
            PsiTreeUtil.findChildOfType(expressionStatement.getExpression(), PsiErrorElement.class) == null &&
            isValidTypeForSwitch(expressionStatement.getExpression().getType(), expressionStatement);
   }

java/java-tests/testData/codeInsight/createSwitch/notAvailableInAssignment.java

@@ -0,0 +1,7 @@
+class Test {
+  int field;
+  
+  void m(int x) {
+    field =<caret> x;
+  }
+}

java/java-tests/testSrc/com/intellij/java/codeInsight/intention/CreateSwitchTest.java

@@ -59,6 +59,10 @@ public class CreateSwitchTest extends JavaCodeInsightFixtureTestCase {
     doTestNotAvailable();
   }
   
+  public void testNotAvailableInAssignment() {
+    doTestNotAvailable();
+  }
+  
   public void testNotAvailableOnRedCode() {
     withJava7(this::doTestNotAvailable);
   }