[gh-11363] Preserve doubled quotes but strip single quotes

- Strip single quotes: "value" -> value
- Preserve doubled quotes: ""value"" -> ""value""
- Always wrap final result in quotes for batch script safety

Author: gnodet

apache-maven/src/assembly/maven/bin/JvmConfigParser.java

@@ -69,15 +69,17 @@ public static void main(String[] args) {
                 line = line.replace("${MAVEN_PROJECTBASEDIR}", mavenProjectBasedir);
                 line = line.replace("$MAVEN_PROJECTBASEDIR", mavenProjectBasedir);
 
-                // Strip outer quotes if present (they're just for grouping in jvm.config)
+                // Strip outer single quotes if present (they're just for grouping in jvm.config)
+                // But preserve already-doubled quotes (escaped quotes like ""value"")
                 if (line.startsWith("\"") && line.endsWith("\"") && line.length() > 1) {
+                    // Check if it's NOT already escaped (doubled quotes at start/end)
+                    if (!(line.length() >= 4 && line.startsWith("\"\"") && line.endsWith("\"\""))) {
+                        line = line.substring(1, line.length() - 1);
+                    }
+                } else if (line.startsWith("'") && line.endsWith("'") && line.length() > 1) {
                     line = line.substring(1, line.length() - 1);
                 }
 
-                // Quote the argument to protect special characters for batch script
-                // Escape any quotes by doubling them (batch script convention)
-                line = line.replace("\"", "\"\"");
-
                 // Append quoted argument with space separator
                 if (result.length() > 0) {
                     result.append(' ');