From f92cc7bbecb30be8f28494ca1eb2695893297ca8 Mon Sep 17 00:00:00 2001
From: peter <peter@jetbrains.com>
Date: Wed, 2 Nov 2016 17:48:30 +0100
Subject: [PATCH] call GeneratedSourcesFilter in a read action

---
 .../com/intellij/openapi/roots/GeneratedSourcesFilter.java    | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/platform/analysis-api/src/com/intellij/openapi/roots/GeneratedSourcesFilter.java b/platform/analysis-api/src/com/intellij/openapi/roots/GeneratedSourcesFilter.java
index bda376666f62..0e0edd506635 100644
--- a/platform/analysis-api/src/com/intellij/openapi/roots/GeneratedSourcesFilter.java
+++ b/platform/analysis-api/src/com/intellij/openapi/roots/GeneratedSourcesFilter.java
@@ -15,6 +15,7 @@
  */
 package com.intellij.openapi.roots;
 
+import com.intellij.openapi.application.ReadAction;
 import com.intellij.openapi.extensions.ExtensionPointName;
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.vfs.VirtualFile;
@@ -32,7 +33,8 @@ public abstract class GeneratedSourcesFilter {
   public static final ExtensionPointName<GeneratedSourcesFilter> EP_NAME = ExtensionPointName.create("com.intellij.generatedSourcesFilter");
 
   public static boolean isGeneratedSourceByAnyFilter(@NotNull VirtualFile file, @NotNull Project project) {
-    return Arrays.stream(EP_NAME.getExtensions()).anyMatch(filter -> filter.isGeneratedSource(file, project));
+    return ReadAction.compute(() -> !project.isDisposed() &&
+                                    Arrays.stream(EP_NAME.getExtensions()).anyMatch(filter -> filter.isGeneratedSource(file, project)));
   }
 
   public abstract boolean isGeneratedSource(@NotNull VirtualFile file, @NotNull Project project);