public static boolean isTrimmedEmpty( String str ) {
		int length = str.length();
		int beginIndex = trimBegin( str, 0, length );
		int endIndex = trimEnd( str, beginIndex, length );
		return beginIndex >= endIndex;
	}
This is equal to {@code str.trim().isEmpty()},
but avoids temporary trimmed substring allocation.

@since 2
flatlaf-core/src/main/java/com/formdev/flatlaf/util/StringUtils.java