From c3a832cf01c827debd189f9a9ad0f013e0ba6554 Mon Sep 17 00:00:00 2001
From: peter <peter@jetbrains.com>
Date: Mon, 25 Apr 2016 15:25:25 +0200
Subject: [PATCH] PsiChangeHandler: explain when transaction can be null

---
 .../com/intellij/codeInsight/daemon/impl/PsiChangeHandler.java   | 1 +
 1 file changed, 1 insertion(+)

diff --git a/platform/lang-impl/src/com/intellij/codeInsight/daemon/impl/PsiChangeHandler.java b/platform/lang-impl/src/com/intellij/codeInsight/daemon/impl/PsiChangeHandler.java
index 463af0726872..19910683878a 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/daemon/impl/PsiChangeHandler.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/daemon/impl/PsiChangeHandler.java
@@ -208,6 +208,7 @@ class PsiChangeHandler extends PsiTreeChangeAdapter implements Disposable {
     Document document = pdm.getCachedDocument(file);
     if (document != null) {
       if (pdm.getSynchronizer().getTransaction(document) == null) {
+        // content reload, language level change or some other big change
         myFileStatusMap.markAllFilesDirty(child);
         return;
       }