compat/maven-embedder/src/main/java/org/apache/maven/cli/props/MavenProperties.java [329:355]:
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    public boolean update(MavenProperties properties) {
        boolean modified = false;
        // Remove "removed" properties from the cfg file
        for (String key : new ArrayList<String>(this.keySet())) {
            if (!properties.containsKey(key)) {
                this.remove(key);
                modified = true;
            }
        }
        // Update existing keys
        for (String key : properties.keySet()) {
            String v = this.get(key);
            List<String> comments = properties.getComments(key);
            List<String> value = properties.getRaw(key);
            if (v == null) {
                this.put(key, comments, value);
                modified = true;
            } else if (!v.equals(properties.get(key))) {
                if (comments.isEmpty()) {
                    comments = this.getComments(key);
                }
                this.put(key, comments, value);
                modified = true;
            }
        }
        return modified;
    }
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impl/maven-cli/src/main/java/org/apache/maven/cling/props/MavenProperties.java [328:354]:
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    public boolean update(MavenProperties properties) {
        boolean modified = false;
        // Remove "removed" properties from the cfg file
        for (String key : new ArrayList<String>(this.keySet())) {
            if (!properties.containsKey(key)) {
                this.remove(key);
                modified = true;
            }
        }
        // Update existing keys
        for (String key : properties.keySet()) {
            String v = this.get(key);
            List<String> comments = properties.getComments(key);
            List<String> value = properties.getRaw(key);
            if (v == null) {
                this.put(key, comments, value);
                modified = true;
            } else if (!v.equals(properties.get(key))) {
                if (comments.isEmpty()) {
                    comments = this.getComments(key);
                }
                this.put(key, comments, value);
                modified = true;
            }
        }
        return modified;
    }
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