@Override
	public void fontChanged(String fontId, Font f) {
		if (fontId.equals(baseFontId)) {
			updateDefaultFont(f);
		}
		else if (fontId.equals(fixedWidthFontId)) {
			fixedWidthFont = f;
		}
	}
Sets this renderer's fixed width theme font id.  
@param fontId the font id
@see Gui#registerFont(Component, String)
Ghidra/Framework/Docking/src/main/java/docking/widgets/AbstractGCellRenderer.java