JetPositionManager: fix finding psi file by source name

idea/src/org/jetbrains/kotlin/idea/util/DebuggerUtils.java

@@ -78,7 +78,7 @@ public class DebuggerUtils {
             return filesWithExactName.iterator().next();
         }
 
-        if (!isPackagePartClassName(className)) {
+        if (isPackageClassName(className)) {
             for (JetFile file : filesWithExactName) {
                 boolean hasTopLevelMembers = KotlinPackage.any(file.getDeclarations(), new Function1<JetDeclaration, Boolean>() {
                     @Override
@@ -90,6 +90,7 @@ public class DebuggerUtils {
             }
         }
 
+        if (isPackagePartClassName(className)) {
             JetFile file = getFileForPackagePartPrefixedName(filesWithExactName, className.getInternalName());
             if (file != null) {
                 return file;
@@ -118,14 +119,22 @@ public class DebuggerUtils {
             return null;
         }
 
+        return filesWithExactName.iterator().next();
+    }
+
     private static boolean isPackagePartClassName(JvmClassName className) {
-        FqName packageFqName = PackageClassUtils.getPackageClassFqName(className.getPackageFqName());
+        String packageName = PackageClassUtils.getPackageClassInternalName(className.getPackageFqName());
-        String packageName = packageFqName.asString().replaceAll("\\.", "/");
 
         String internalName = className.getInternalName();
         return !internalName.equals(packageName) && internalName.startsWith(packageName);
     }
 
+    private static boolean isPackageClassName(JvmClassName className) {
+        String packageName = PackageClassUtils.getPackageClassInternalName(className.getPackageFqName());
+
+        return packageName.equals(className.getInternalName());
+    }
+
     @Nullable
     private static JetFile getFileForPackagePartPrefixedName(
             @NotNull Collection<JetFile> allPackageFiles,