accept inline on method reference (IDEA-102845)

java/java-impl/src/com/intellij/refactoring/inline/InlineMethodProcessor.java

@@ -1028,6 +1028,7 @@ public class InlineMethodProcessor extends BaseRefactoringProcessor {
       initializer.accept(canAllLocalsBeDeclaredFinal);
       if (!canAllLocalsBeDeclaredFinal.success) return false;
     }
+    if (initializer instanceof PsiMethodReferenceExpression) return true;
     if (initializer instanceof PsiReferenceExpression) {
       PsiVariable refVar = (PsiVariable)((PsiReferenceExpression)initializer).resolve();
       if (refVar == null) {

java/java-tests/testData/refactoring/inlineMethod/OnMethodReference.java

@@ -0,0 +1,11 @@
+class Foo {
+    interface Jjj {
+        int[] jjj(int p);
+    }
+    void useJjj(Jjj p) {
+        p.jjj(9);
+    }
+    void test() {
+        use<caret>Jjj(int[]::new);
+    }
+}

java/java-tests/testData/refactoring/inlineMethod/OnMethodReference.java.after

@@ -0,0 +1,11 @@
+class Foo {
+    interface Jjj {
+        int[] jjj(int p);
+    }
+    void useJjj(Jjj p) {
+        p.jjj(9);
+    }
+    void test() {
+        ((Jjj) int[]::new).jjj(9);
+    }
+}

java/java-tests/testSrc/com/intellij/refactoring/inline/InlineMethodTest.java

@@ -250,6 +250,10 @@ public class InlineMethodTest extends LightRefactoringTestCase {
     doTestInlineThisOnly();
   }
 
+  public void testOnMethodReference() throws Exception {
+    doTestInlineThisOnly();
+  }
+
   public void testNonCodeUsage() throws Exception {
     doTest(true);
   }