private void updateDefaultFont(Font f) {
		if (Objects.equals(f, defaultFont)) {
			return;
		}

		defaultFont = f;
		boldFont = f.deriveFont(Font.BOLD);
		italicFont = f.deriveFont(Font.ITALIC);
	}
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