IDEA-87938 Completion: extend 'middle-matching' by '*word*parts*' in completion

java/java-tests/testData/fileStructure/filtering/Camel.tree

@@ -1,3 +1,5 @@
 -Camel.java
  -Camel
-  [getSomeHead():void]
+  [doSomethingWithMyHead():void]
+  getSomeArtHeader():void
+  getSomeHead():void

java/java-tests/testSrc/com/intellij/codeInsight/completion/SecondSmartTypeCompletionTest.java

@@ -80,7 +80,11 @@ public class SecondSmartTypeCompletionTest extends LightCompletionTestCase {
   }
 
   public void testNoObjectMethodsAsFirstPart() throws Throwable { doTest(); }
-  public void testGetClassLoader() throws Throwable { doTest(); }
+  public void testGetClassLoader() throws Throwable {
+    configure();
+    selectItem(myItems[0]);
+    checkResult();
+  }
   public void testNewStaticProblem() throws Throwable { doTest(); }
 
   public void testChainingPerformance() throws Throwable {