From d19bf6759c167376b7fa2ffa5b5198210bad968e Mon Sep 17 00:00:00 2001
From: Janne Valkealahti <janne.valkealahti@gmail.com>
Date: Fri, 12 Apr 2024 17:10:31 +0100
Subject: [PATCH] Synchronize display call

- In TerminalUI a display call may be called from
  multiple threads, while only seen to happen on
  windows, should be synchronized.
- Backport #1039
- Fixes #1040
---
 .../org/springframework/shell/component/view/TerminalUI.java  | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/spring-shell-core/src/main/java/org/springframework/shell/component/view/TerminalUI.java b/spring-shell-core/src/main/java/org/springframework/shell/component/view/TerminalUI.java
index da22bdae..87e0107b 100644
--- a/spring-shell-core/src/main/java/org/springframework/shell/component/view/TerminalUI.java
+++ b/spring-shell-core/src/main/java/org/springframework/shell/component/view/TerminalUI.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2023 the original author or authors.
+ * Copyright 2023-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -257,7 +257,7 @@ public class TerminalUI implements ViewService {
 		this.nonfullScreenViewRect = nonfullScreenViewRect;
 	}
 
-	private void display() {
+	private synchronized void display() {
 		log.trace("display() start");
 		size.copy(terminal.getSize());
 		if (fullScreen) {