public void increment() {
		marker++;

		// keep walking our list until we find an unvalidated line
		while (marker < myLines.size()) {
			ValidatableLine line = myLines.get(marker);
			if (!line.isValidated()) {
				return;
			}
			marker++;
		}
	}
Push forward the current marker position.  The marker starts at the beginning and 
only moves forward past validated lines.
Ghidra/Features/Base/src/main/java/ghidra/app/util/html/diff/DiffLinesValidator.java