From 3b1038f831a243e2a6941d1629988ecdb23490d7 Mon Sep 17 00:00:00 2001
From: Dmitry Yudin <dmitry.yudin@jetbrains.com>
Date: Wed, 4 Feb 2026 15:28:33 +0100
Subject: [PATCH] IJPL-233389 [UI]: Fix IndexOutOfBoundsException in
 IdeErrorsDialog

Add bounds checking to myIndex setter to prevent invalid index values

GitOrigin-RevId: ef7a1279e9ec95fd743b8285a1f9d7b78469802f
---
 .../src/com/intellij/diagnostic/IdeErrorsDialog.kt           | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/platform/platform-impl/src/com/intellij/diagnostic/IdeErrorsDialog.kt b/platform/platform-impl/src/com/intellij/diagnostic/IdeErrorsDialog.kt
index d56800c676ce..3abb0c0cb3e4 100644
--- a/platform/platform-impl/src/com/intellij/diagnostic/IdeErrorsDialog.kt
+++ b/platform/platform-impl/src/com/intellij/diagnostic/IdeErrorsDialog.kt
@@ -116,7 +116,10 @@ open class IdeErrorsDialog @ApiStatus.Internal @JvmOverloads constructor(
 ) : DialogWrapper(myProject, true), MessagePoolListener, UiDataProvider {
   private val myAcceptedNotices: MutableSet<String>
   private val myMessageClusters: MutableList<MessageCluster> = ArrayList() // exceptions with the same stacktrace
-  private var myIndex: Int
+  private var myIndex: Int = 0
+    set(value) {
+      field = value.coerceIn(0, (myMessageClusters.size - 1).coerceAtLeast(0))
+    }
   private var myLastIndex = -1
   private var myUpdateControlsJob: Job = SupervisorJob()