From 3eb83020bf5d9a5f6abbe6d34e9ab686e3e4191f Mon Sep 17 00:00:00 2001
From: Daniel Puckowski <puckowski.d@gmail.com>
Date: Sat, 30 Aug 2025 14:54:29 -0400
Subject: [PATCH 1/2] fix(issue#4339): limit whitespace check

* Fix issue #4339 by limiting the whitespace check for the deprecation
  notice to not produce false positives.
---
 packages/less/src/less/parser/parser.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/packages/less/src/less/parser/parser.js b/packages/less/src/less/parser/parser.js
index 76676f5fe..b9279a0d9 100644
--- a/packages/less/src/less/parser/parser.js
+++ b/packages/less/src/less/parser/parser.js
@@ -972,7 +972,10 @@ const Parser = function Parser(context, imports, fileInfo, currentIndex) {
                     if (elements) {
                         parensIndex = parserInput.i;
                         if (parserInput.$char('(')) {
-                            parensWS = parserInput.isWhitespace(-2);
+                            parserInput.save();
+                            parensWS = parserInput.$re(/[ \t\u00A0]$/, -2);
+                            parserInput.forget();
+
                             args = this.args(true).args;
                             expectChar(')');
                             hasParens = true;

From 043c19581dfdbcd8162865044137ed35089742d9 Mon Sep 17 00:00:00 2001
From: Daniel Puckowski <puckowski.d@gmail.com>
Date: Sat, 30 Aug 2025 15:29:30 -0400
Subject: [PATCH 2/2] fix(issue#4339): correct deprecation notice

* Correct deprecation notice for issue #4339.
---
 packages/less/src/less/parser/parser.js | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/packages/less/src/less/parser/parser.js b/packages/less/src/less/parser/parser.js
index b9279a0d9..d77f2dd6b 100644
--- a/packages/less/src/less/parser/parser.js
+++ b/packages/less/src/less/parser/parser.js
@@ -971,11 +971,8 @@ const Parser = function Parser(context, imports, fileInfo, currentIndex) {
 
                     if (elements) {
                         parensIndex = parserInput.i;
-                        if (parserInput.$char('(')) {
-                            parserInput.save();
-                            parensWS = parserInput.$re(/[ \t\u00A0]$/, -2);
-                            parserInput.forget();
-
+                        parensWS = parserInput.isWhitespace(-1);
+                        if (parserInput.$char('(')) { 
                             args = this.args(true).args;
                             expectChar(')');
                             hasParens = true;