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

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

		fixedWidthFontId = fontId;
		Gui.registerFont(this, fixedWidthFontId);
	}
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