Fix numbering in debugger tests

Line number in SourcePosition is actually 0-based

idea/testData/debugger/twoClasses.kt

@@ -0,0 +1,2 @@
+class A { fun f() {} } // A
+class B { fun g() {} } // B

idea/tests/org/jetbrains/jet/plugin/debugger/JetPositionManagerTest.java

@@ -117,4 +117,8 @@ public class JetPositionManagerTest extends PositionManagerTestCase {
     public void testTrait() {
         doTest();
     }
+
+    public void testTwoClasses() {
+        doTest();
+    }
 }

idea/tests/org/jetbrains/jet/plugin/debugger/PositionManagerTestCase.java

@@ -122,8 +122,7 @@ public abstract class PositionManagerTestCase extends MultiFileTestCase {
         for (int i = 0; i < lines.length; i++) {
             Matcher matcher = BREAKPOINT_PATTERN.matcher(lines[i]);
             if (matcher.matches()) {
-                // Line breakpoint numbers are 1-based
-                breakpoints.add(new Breakpoint(file, i + 1, matcher.group(1)));
+                breakpoints.add(new Breakpoint(file, i, matcher.group(1)));
             }
         }
 
@@ -168,7 +167,7 @@ public abstract class PositionManagerTestCase extends MultiFileTestCase {
 
     private static class Breakpoint {
         private final JetFile file;
-        private final int lineNumber;
+        private final int lineNumber; // 0-based
         private final String className;
 
         private Breakpoint(JetFile file, int lineNumber, String className) {