explicit no read access assert

platform/lang-impl/src/com/intellij/openapi/fileTypes/impl/NativeFileIconProvider.java

@@ -17,6 +17,7 @@
 package com.intellij.openapi.fileTypes.impl;
 
 import com.intellij.ide.FileIconProvider;
+import com.intellij.openapi.application.ApplicationManager;
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.util.SystemInfo;
 import com.intellij.openapi.vfs.VirtualFile;
@@ -68,6 +69,7 @@ public class NativeFileIconProvider implements FileIconProvider {
         }
         Icon icon;
         try { // VM will ensure lock to init -static final field--, note we should have no read access here, to avoid deadlock with EDT needed to init component
+          assert !ApplicationManager.getApplication().isReadAccessAllowed();
           icon = SwingComponentHolder.ourFileChooser.getIcon(f);
         }
         catch (Exception e) {      // see http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4854174