public void setBaseFontId(String fontId) {
		if (baseFontId != null) {
			Gui.unRegisterFont(this, baseFontId);
		}

		Font f = Gui.getFont(fontId);
		updateDefaultFont(f);

		baseFontId = fontId;
		Gui.registerFont(this, baseFontId);
	}
Sets this renderer's theme font id.  This will be used to load the base font and to create
the derived fonts, such as bold and fixed width.
@param fontId the font id
@see Gui#registerFont(Component, String)
Ghidra/Framework/Docking/src/main/java/docking/widgets/AbstractGCellRenderer.java