[platform] IJPL-158412: Do not fill stacktrace on cancellation of NonBlockingReadAction

GitOrigin-RevId: b415918b261915f230005e9c1cec5428156ec315

platform/platform-impl/src/com/intellij/openapi/application/impl/NonBlockingReadActionImpl.java

@@ -329,7 +329,9 @@ public final class NonBlockingReadActionImpl<T> implements NonBlockingReadAction
       // We need to abort the job only in the first case, but not in the second one.
       // Because in the case of `setResult` there can be a UI callback, and we need to cancel Job strictly after the callback finishes.
       if (!isSucceeded()) {
-        cancelJob(new CancellationException());
+        // we must not create CancellationException here,
+        // because filling the stacktrace causes performance degradation
+        cancelJob(null);
       }
       cleanupIfNeeded();
       return result;

platform/platform-tests/testSrc/com/intellij/util/concurrency/CancellationPropagationTest.kt

@@ -727,7 +727,7 @@ class CancellationPropagationTest {
   }
 
   @RepeatedTest(1000)
-  fun `synchronous non-blocking read action is awaited`() = runBlocking {
+  fun `synchronous non-blocking read action is awaited`() = timeoutRunBlocking {
     val dummyDisposable = Disposer.newDisposable()
     var allowedToCompleteRA by AtomicReference(false)
     val readActionCompletedSemaphore = Semaphore(1)
@@ -761,7 +761,7 @@ class CancellationPropagationTest {
         .submit(executor)
     }
     Disposer.dispose(dummyDisposable)
-    // if NBRA is not properly canceled, we would have a leaking Job, and `blockingContextScope would never finish`
+    // if NBRA is not properly canceled, we would have a leaking Job, and `blockingContextScope` would never finish
     job.join()
   }