extract method: do not include comments when they were not included in selection; leave assignment expressions untouched? (IDEA-72730 )

java/java-impl/src/com/intellij/refactoring/extractMethod/ExtractMethodProcessor.java

@@ -201,7 +201,7 @@ public class ExtractMethodProcessor implements MatchProvider {
     myExpression = null;
     if (myElements.length == 1 && myElements[0] instanceof PsiExpression) {
       final PsiExpression expression = (PsiExpression)myElements[0];
-      if (expression.getParent() instanceof PsiExpressionStatement) {
+      if (expression instanceof PsiAssignmentExpression && expression.getParent() instanceof PsiExpressionStatement) {
         myElements[0] = expression.getParent();
       }
       else {

java/java-tests/testData/refactoring/extractMethod/LeaveCommentsWhenExpressionExtracted.java

@@ -0,0 +1,6 @@
+class Test {
+  void bar(){}
+  void foo() {
+    <selection>bar();</selection>//some comment here
+  }
+}

java/java-tests/testData/refactoring/extractMethod/LeaveCommentsWhenExpressionExtracted_after.java

@@ -0,0 +1,10 @@
+class Test {
+  void bar(){}
+  void foo() {
+    newMethod();//some comment here
+  }
+
+    private void newMethod() {
+        bar();
+    }
+}

java/java-tests/testSrc/com/intellij/refactoring/ExtractMethodTest.java

@@ -124,6 +124,10 @@ public class ExtractMethodTest extends LightCodeInsightTestCase {
     doTest();
   }
 
+  public void testLeaveCommentsWhenExpressionExtracted() throws Exception {
+    doTest();
+  }
+
   public void testSCR15815() throws Exception {
     doTest();
   }