From a8293892547076dcee40fe7c06803a2a5868cb2f Mon Sep 17 00:00:00 2001
From: Sergey Evdokimov <sergey.evdokimov@jetbrains.com>
Date: Mon, 25 Jul 2011 16:47:39 +0400
Subject: [PATCH] IDEA-54251 (IDEA incorrectly altering grailsPlugins.iml file
 on Cache Invalidation)

---
 .../plugins/groovy/mvc/MvcWatchedRootProvider.java     | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/plugins/groovy/src/org/jetbrains/plugins/groovy/mvc/MvcWatchedRootProvider.java b/plugins/groovy/src/org/jetbrains/plugins/groovy/mvc/MvcWatchedRootProvider.java
index 0da63368e7c8..d8e5dd45b76e 100644
--- a/plugins/groovy/src/org/jetbrains/plugins/groovy/mvc/MvcWatchedRootProvider.java
+++ b/plugins/groovy/src/org/jetbrains/plugins/groovy/mvc/MvcWatchedRootProvider.java
@@ -27,16 +27,16 @@ public class MvcWatchedRootProvider implements WatchedRootsProvider {
 
   @NotNull
   public Set<String> getRootsToWatch() {
-    if (!myProject.isInitialized()) {
-      return Collections.emptySet();
-    }
+    if (!myProject.isInitialized()) return Collections.emptySet();
 
-    final Set<String> result = new HashSet<String>();
+    Set<String> result = null;
 
     for (Module module : ModuleManager.getInstance(myProject).getModules()) {
       final MvcFramework framework = MvcModuleStructureSynchronizer.getFramework(module);
       if (framework == null) continue;
 
+      if (result == null) result = new HashSet<String>();
+
       final File sdkWorkDir = framework.getCommonPluginsDir(module);
       if (sdkWorkDir != null) {
         result.add(sdkWorkDir.getAbsolutePath());
@@ -48,7 +48,7 @@ public class MvcWatchedRootProvider implements WatchedRootsProvider {
       }
     }
 
-    return result;
+    return result == null ? Collections.<String>emptySet() : result;
   }
 
 }