public String getSourceName() {
		if (sourceDTM != null) {
			return sourceDTM.getName();
		}
		return sourceArchive.getName();
	}
Compares the two HTML strings to find the widest *rendered* text and then creates
an HTML string of spaces that is wide enough to represent that width.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/datamgr/DataTypeSynchronizer.java