From f1702261d740fbdca78ae1fbf87b66a59921e685 Mon Sep 17 00:00:00 2001
From: Hiroshi SHIBATA <hsbt@ruby-lang.org>
Date: Thu, 30 May 2024 10:32:33 +0900
Subject: [PATCH] Suppress warnings about frozen string literal feature

```
tool/redmine-backporter.rb:69: warning: literal string will be frozen in the future
```
---
 tool/redmine-backporter.rb | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/tool/redmine-backporter.rb b/tool/redmine-backporter.rb
index 3f5c6feca9..843132ab3a 100755
--- a/tool/redmine-backporter.rb
+++ b/tool/redmine-backporter.rb
@@ -66,25 +66,25 @@ class String
   def color(fore=nil, back=nil, opts={}, bold: false, underscore: false)
     seq = ""
     if bold || opts[:bold]
-      seq << "\e[1m"
+      seq = seq + "\e[1m"
     end
     if underscore || opts[:underscore]
-      seq << "\e[2m"
+      seq = seq + "\e[2m"
     end
     if fore
       c = COLORS[fore]
       raise "unknown foreground color #{fore}" unless c
-      seq << "\e[#{c}m"
+      seq = seq + "\e[#{c}m"
     end
     if back
       c = COLORS[back]
       raise "unknown background color #{back}" unless c
-      seq << "\e[#{c + 10}m"
+      seq = seq + "\e[#{c + 10}m"
     end
     if seq.empty?
       self
     else
-      seq << self << "\e[0m"
+      seq = seq + self + "\e[0m"
     end
   end
 end