add a test which shows a superiority of the hashed-based stamp approach

GitOrigin-RevId: f0da9d6be7655ca4ee0e35d3b2a4898689ce6751

java/java-tests/testData/compileServer/incremental/common/nothingChanged/TheSameContent.java.new

@@ -0,0 +1,5 @@
+package v;
+
+class TheSameContent {
+  void nothingToRebuild() {}
+}

java/java-tests/testData/compileServer/incremental/common/nothingChanged/src/TheSameContent.java

@@ -0,0 +1,5 @@
+package v;
+
+class TheSameContent {
+  void nothingToRebuild() {}
+}

jps/jps-builders/testSrc/org/jetbrains/ether/CommonTest.java

@@ -177,6 +177,10 @@ public class CommonTest extends IncrementalTestCase {
     doTest();
   }
 
+  public void testNothingChanged() {
+    doTest();
+  }
+
   // Disabled because now several classes with the same qName in different modules are not supporter
   //
   //public void testConflictingClasses() {