From 1513f7024bbc1ee46a9124b191e3407cdfb53c16 Mon Sep 17 00:00:00 2001
From: Konstantin Hudyakov <konstantin.hudyakov@jetbrains.com>
Date: Thu, 21 Aug 2025 16:22:39 +0300
Subject: [PATCH] [terminal] IJPL-203233 Ensure anyLineChanged flag is set
 before flushing the changes

There are reports with exceptions where for some reason, `linesDiscardedFromHistory` is called without preceding `linesChanged`, so `anyLineChanged` flag is not set. As a result, we get NPE here and crush the terminal session emulation.
Since the actual case is unclear, let's just ensure that this flag is set.

GitOrigin-RevId: dcd27ea51fc1dbc69889fe2d9ff443139ea250dd
---
 .../intellij/terminal/backend/TerminalContentChangesTracker.kt   | 1 +
 1 file changed, 1 insertion(+)

diff --git a/plugins/terminal/backend/src/com/intellij/terminal/backend/TerminalContentChangesTracker.kt b/plugins/terminal/backend/src/com/intellij/terminal/backend/TerminalContentChangesTracker.kt
index 049d5e8389bd..b2ac897afb91 100644
--- a/plugins/terminal/backend/src/com/intellij/terminal/backend/TerminalContentChangesTracker.kt
+++ b/plugins/terminal/backend/src/com/intellij/terminal/backend/TerminalContentChangesTracker.kt
@@ -57,6 +57,7 @@ class TerminalContentChangesTracker(
         else {
           val additionalLines = lines.subList(lastChangedVisualLine, lines.size)
           lastChangedVisualLine = 0
+          anyLineChanged = true
           flushChanges(additionalLines)
         }
       }