From 55533e435b5ed53d930bb3b26c0b4d382be01861 Mon Sep 17 00:00:00 2001
From: Alexey Kudravtsev <cdr@intellij.com>
Date: Wed, 16 Aug 2017 14:33:05 +0300
Subject: [PATCH] explicit assertion for starting find usages from within write
 action

---
 .../src/com/intellij/usages/impl/UsageViewManagerImpl.java     | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/platform/usageView/src/com/intellij/usages/impl/UsageViewManagerImpl.java b/platform/usageView/src/com/intellij/usages/impl/UsageViewManagerImpl.java
index 81ce351e64b4..5661d05c0ffa 100644
--- a/platform/usageView/src/com/intellij/usages/impl/UsageViewManagerImpl.java
+++ b/platform/usageView/src/com/intellij/usages/impl/UsageViewManagerImpl.java
@@ -128,6 +128,9 @@ public class UsageViewManagerImpl extends UsageViewManager {
                                     @NotNull final UsageViewPresentation presentation,
                                     @NotNull final FindUsagesProcessPresentation processPresentation,
                                     @Nullable final UsageViewStateListener listener) {
+    if (ApplicationManager.getApplication().isWriteAccessAllowed()) {
+      throw new IllegalStateException("Can't start find usages from under write action. Please consider Application.invokeLater() it instead.");
+    }
     final SearchScope searchScopeToWarnOfFallingOutOf = getMaxSearchScopeToWarnOfFallingOutOf(searchFor);
     final AtomicReference<UsageViewImpl> usageViewRef = new AtomicReference<>();
     long start = System.currentTimeMillis();