fix: avoid modifying state of context in eachUrlPart

Author: tomasbjerre

Diff for: build.gradle

@@ -18,7 +18,7 @@ dependencies {
 
 	testImplementation 'org.slf4j:slf4j-simple:2.0.16'
 	testImplementation 'junit:junit:4.13.2'
-	testImplementation 'org.assertj:assertj-core:3.27.2'
+	testImplementation 'org.assertj:assertj-core:3.27.3'
 	testImplementation 'com.approvaltests:approvaltests:24.14.2'
 	testImplementation 'org.mockito:mockito-core:5.15.2'
 }

Diff for: src/main/java/se/bjurr/gitchangelog/api/helpers/Helpers.java

@@ -28,6 +28,7 @@
 import com.github.jknack.handlebars.Options.Buffer;
 import com.github.jknack.handlebars.helper.EachHelper;
 import java.io.IOException;
+import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;
@@ -243,8 +244,9 @@ public static Map<String, Helper<?>> getAll() {
     helpers.put(
         "eachUrlPart",
         (final Changelog changelog, final Options options) -> {
-          Collections.reverse(changelog.getUrlParts());
-          return each(options, changelog.getUrlParts());
+          List<String> reversedList = new ArrayList<>(changelog.getUrlParts());
+          Collections.reverse(reversedList);
+          return each(options, reversedList);
         });
     return helpers;
   }