From a0a9e48f85f84f80d850da6f349cc754739e62d6 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Wed, 13 Aug 2025 15:19:31 -0400
Subject: [PATCH] StdIo: Fix Terminal abstraction to avoid unnecessary VT100
 escape sequences

Fix commit 329d755dbd (StdIo: Add a Terminal abstraction to print color
text, 2025-05-06, v4.1.0-rc1~151^2~3) to avoid printing a VT100 escape
sequence for normal text if we did not print any sequence initially.
We already use this approach for Windows Console text attributes.

Issue: #26924
---
 Source/cmStdIoTerminal.cxx | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/Source/cmStdIoTerminal.cxx b/Source/cmStdIoTerminal.cxx
index 5baff5e38b..428f7c7fae 100644
--- a/Source/cmStdIoTerminal.cxx
+++ b/Source/cmStdIoTerminal.cxx
@@ -141,9 +141,13 @@ void Print(OStream& os, TermAttrSet const& attrs,
       f(os.IOS());
       break;
     case TermKind::VT100:
-      SetVT100Attrs(os.IOS(), attrs);
-      f(os.IOS());
-      SetVT100Attrs(os.IOS(), TermAttr::Normal);
+      if (!attrs.empty()) {
+        SetVT100Attrs(os.IOS(), attrs);
+        f(os.IOS());
+        SetVT100Attrs(os.IOS(), TermAttr::Normal);
+      } else {
+        f(os.IOS());
+      }
       break;
 #ifdef _WIN32
     case TermKind::Console: {