VirtualFileWindow should be invalidated together with DocumentWindow (EA-79578 - assert: PsiDocumentManagerBase.getLastCommittedDocument)

java/java-tests/testSrc/com/intellij/psi/impl/smartPointers/PsiAnchorTest.java

@@ -16,10 +16,8 @@
 package com.intellij.psi.impl.smartPointers;
 
 import com.intellij.openapi.command.WriteCommandAction;
-import com.intellij.psi.PsiAnchor;
-import com.intellij.psi.PsiDocumentManager;
-import com.intellij.psi.PsiFile;
-import com.intellij.psi.PsiWhiteSpace;
+import com.intellij.psi.*;
+import com.intellij.psi.impl.source.tree.injected.MyTestInjector;
 import com.intellij.psi.xml.XmlToken;
 import com.intellij.testFramework.fixtures.LightCodeInsightFixtureTestCase;
 
@@ -39,4 +37,17 @@ public class PsiAnchorTest extends LightCodeInsightFixtureTestCase {
     assertNull(anchor.retrieve());
   }
 
+  public void testInjectedAnchor() {
+    new MyTestInjector(getPsiManager()).injectAll(getTestRootDisposable());
+    myFixture.configureByText("a.java", "class X { String java=\"class <caret>Foo {}\"}");
+    PsiClass cls = (PsiClass)myFixture.getElementAtCaret();
+    assertEquals("Foo", cls.getName());
+    PsiAnchor anchor = PsiAnchor.create(cls);
+
+    myFixture.type('\n');
+    PsiDocumentManager.getInstance(getProject()).commitAllDocuments();
+
+    assertNull(anchor.retrieve()); // file is changed, so we can't restore. But this call shouldn't throw exceptions.
+  }
+
 }

platform/lang-impl/src/com/intellij/injected/editor/VirtualFileWindowImpl.java

@@ -49,7 +49,7 @@ public class VirtualFileWindowImpl extends LightVirtualFile implements VirtualFi
 
   @Override
   public boolean isValid() {
-    return myDelegate.isValid();
+    return myDelegate.isValid() && myDocumentWindow.isValid();
   }
 
   @Override