private void doAddHighlight(ClangToken clangToken, Color highlightColor,
			TokenHighlights currentHighlights) {

		if (highlightColor == null) {
			return;
		}

		// store the actual requested color
		currentHighlights.add(new HighlightToken(clangToken, highlightColor));
		updateHighlightColor(clangToken);
	}
Adds the given secondary highlighter, but does not create any highlights.  All secondary
highlighters pertain to a given function.
@param function the function
@param highlighter the highlighter
Ghidra/Features/Decompiler/src/main/java/ghidra/app/decompiler/component/ClangHighlightController.java