private String get( Properties properties, Map<String, String> themeSpecificProps, String key ) {
		return themeSpecificProps.getOrDefault( key, (String) properties.get( key ) );
	}
Loads a IntelliJ .theme.json file from the given input stream.

The input stream is automatically closed.
Using a buffered input stream is not necessary.
flatlaf-core/src/main/java/com/formdev/flatlaf/IntelliJTheme.java