From fefb10c63907ebadd92e3da2b4f7416fee7f0e3a Mon Sep 17 00:00:00 2001
From: Jakob Klaushofer <jakob.klaushofer@jetbrains.com>
Date: Fri, 4 Jul 2025 19:20:19 +0200
Subject: [PATCH] [ai-completion] IJPL-195112 Fix out of bounds document access
 on terminal resize

GitOrigin-RevId: 53878f683772ff41c0298016ad19483b46e746ff
---
 .../com/intellij/terminal/frontend/ReworkedTerminalView.kt    | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/plugins/terminal/frontend/src/com/intellij/terminal/frontend/ReworkedTerminalView.kt b/plugins/terminal/frontend/src/com/intellij/terminal/frontend/ReworkedTerminalView.kt
index d03ce4ee4e50..b2d568434a16 100644
--- a/plugins/terminal/frontend/src/com/intellij/terminal/frontend/ReworkedTerminalView.kt
+++ b/plugins/terminal/frontend/src/com/intellij/terminal/frontend/ReworkedTerminalView.kt
@@ -465,6 +465,10 @@ internal class ReworkedTerminalView(
         val inlineCompletionTypingSession = InlineCompletion.getHandlerOrNull(editor)?.typingSessionTracker
         val lastBlock = editor.getUserData(TerminalBlocksModel.KEY)?.blocks?.lastOrNull() ?: return
         val lastBlockCommandStartIndex = if (lastBlock.commandStartOffset != -1) lastBlock.commandStartOffset else lastBlock.startOffset
+
+        // When resizing the terminal, the blocks model may fall out of sync for a short time.
+        // These updates will never trigger a completion, so we return early to avoid reading out of bounds.
+        if (lastBlockCommandStartIndex >= editor.document.textLength) return
         val curCommandText = editor.document.text.substring(lastBlockCommandStartIndex, editor.document.textLength).trim()
 
         if (isTypeAhead) {