From 6f3cf388f99588725a27c5d33152febbcf9ae0f5 Mon Sep 17 00:00:00 2001
From: Alexey Kudravtsev <cdr@intellij.com>
Date: Wed, 25 Oct 2017 15:36:14 +0300
Subject: [PATCH] IDEA-181019 Error when doing a 'find usage' with 'derived
 class' selected in dialog

---
 platform/core-api/src/com/intellij/usageView/UsageInfo.java | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/platform/core-api/src/com/intellij/usageView/UsageInfo.java b/platform/core-api/src/com/intellij/usageView/UsageInfo.java
index 15e6e0611d81..3a767a71bc8e 100644
--- a/platform/core-api/src/com/intellij/usageView/UsageInfo.java
+++ b/platform/core-api/src/com/intellij/usageView/UsageInfo.java
@@ -49,8 +49,9 @@ public class UsageInfo {
     int effectiveEnd;
     if (startOffset == -1 && endOffset == -1) {
       // calculate natural element range
-      effectiveStart = element.getTextOffset() - elementRange.getStartOffset();
-      effectiveEnd = elementRange.getLength();
+      // Cls element.getTextOffset() returns -1
+      effectiveStart = Math.max(0, element.getTextOffset() - elementRange.getStartOffset());
+      effectiveEnd = Math.max(effectiveStart, elementRange.getLength());
     }
     else {
       effectiveStart = startOffset;