compat/maven-embedder/src/main/java/org/apache/maven/cli/props/MavenProperties.java [275:306]:
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    public String put(String key, List<String> commentLines, List<String> valueLines) {
        commentLines = new ArrayList<>(commentLines);
        valueLines = new ArrayList<>(valueLines);
        String escapedKey = escapeKey(key);
        StringBuilder sb = new StringBuilder();
        // int lastLine = valueLines.size() - 1;
        if (valueLines.isEmpty()) {
            valueLines.add(escapedKey + "=");
            sb.append(escapedKey).append("=");
        } else {
            String val0 = valueLines.get(0);
            String rv0 = typed ? val0 : escapeJava(val0);
            if (!val0.trim().startsWith(escapedKey)) {
                valueLines.set(0, escapedKey + " = " + rv0 /*+ (0 < lastLine? "\\": "")*/);
                sb.append(escapedKey).append(" = ").append(rv0);
            } else {
                valueLines.set(0, rv0 /*+ (0 < lastLine? "\\": "")*/);
                sb.append(rv0);
            }
        }
        for (int i = 1; i < valueLines.size(); i++) {
            String val = valueLines.get(i);
            valueLines.set(i, typed ? val : escapeJava(val) /*+ (i < lastLine? "\\": "")*/);
            while (!val.isEmpty() && Character.isWhitespace(val.charAt(0))) {
                val = val.substring(1);
            }
            sb.append(val);
        }
        String[] property = PropertiesReader.parseProperty(sb.toString());
        this.layout.put(key, new Layout(commentLines, valueLines));
        return storage.put(key, property[1]);
    }
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impl/maven-cli/src/main/java/org/apache/maven/cling/props/MavenProperties.java [274:305]:
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    public String put(String key, List<String> commentLines, List<String> valueLines) {
        commentLines = new ArrayList<>(commentLines);
        valueLines = new ArrayList<>(valueLines);
        String escapedKey = escapeKey(key);
        StringBuilder sb = new StringBuilder();
        // int lastLine = valueLines.size() - 1;
        if (valueLines.isEmpty()) {
            valueLines.add(escapedKey + "=");
            sb.append(escapedKey).append("=");
        } else {
            String val0 = valueLines.get(0);
            String rv0 = typed ? val0 : escapeJava(val0);
            if (!val0.trim().startsWith(escapedKey)) {
                valueLines.set(0, escapedKey + " = " + rv0 /*+ (0 < lastLine? "\\": "")*/);
                sb.append(escapedKey).append(" = ").append(rv0);
            } else {
                valueLines.set(0, rv0 /*+ (0 < lastLine? "\\": "")*/);
                sb.append(rv0);
            }
        }
        for (int i = 1; i < valueLines.size(); i++) {
            String val = valueLines.get(i);
            valueLines.set(i, typed ? val : escapeJava(val) /*+ (i < lastLine? "\\": "")*/);
            while (!val.isEmpty() && Character.isWhitespace(val.charAt(0))) {
                val = val.substring(1);
            }
            sb.append(val);
        }
        String[] property = PropertiesReader.parseProperty(sb.toString());
        this.layout.put(key, new Layout(commentLines, valueLines));
        return storage.put(key, property[1]);
    }
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