private String getPreviousBuildErrors() {
		return buildErrors.values()
				.stream()
				.map(BuildError::getMessage)
				.collect(Collectors.joining());
	}
Get the mapping from source file to BuildError.

@return the error file map
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/osgi/GhidraSourceBundle.java