if I invoked another completion instance, the previous one should be canceled, and not restarted

platform/lang-impl/src/com/intellij/codeInsight/completion/CompletionProgressIndicator.java

@@ -88,7 +88,7 @@ public class CompletionProgressIndicator extends ProgressIndicatorBase implement
   };
   private LightweightHint myHint;
   private final Semaphore myFreezeSemaphore;
-  private boolean myToRestart;
+  private Boolean myToRestart;
 
   private boolean myModifiersReleased;
 
@@ -436,6 +436,8 @@ public class CompletionProgressIndicator extends ProgressIndicatorBase implement
   }
 
   private void finishCompletionProcess() {
+    assert myToRestart == null;
+    myToRestart = false;
     cancel();
 
     assert !myDisposed;
@@ -474,7 +476,7 @@ public class CompletionProgressIndicator extends ProgressIndicatorBase implement
     invokeLaterIfNotDispatch(new Runnable() {
       public void run() {
         if (isOutdated()) return;
-        if (isCanceled() && !myToRestart) return; // otherwise
+        if (isCanceled() && myToRestart != Boolean.TRUE) return;
 
         //what if a new completion was invoked by the user before this 'later'?
         if (CompletionProgressIndicator.this != CompletionServiceImpl.getCompletionService().getCurrentCompletion()) return;
@@ -528,6 +530,11 @@ public class CompletionProgressIndicator extends ProgressIndicatorBase implement
   }
 
   public void cancelByWriteAction() {
+    if (myToRestart != null) {
+      assert myToRestart == Boolean.FALSE; //explicit completionFinished was invoked before this write action
+      return;
+    }
+
     myToRestart = true;
     cancel();
 
@@ -605,7 +612,7 @@ public class CompletionProgressIndicator extends ProgressIndicatorBase implement
   }
 
   public void prefixUpdated() {
-    if (myToRestart) {
+    if (myToRestart == Boolean.TRUE) {
       scheduleRestart();
       return;
     }