@Override
	public TableCellRenderer getCellRenderer(int row, int col) {
		return renderer;
	}
We need to override the renderer for the following cases:
<ul>
  <li>italicize tags that cannot be edited</li>
  <li>disable rows in the source table that have already been added to the selected function </li>
</ul>
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/function/tags/FunctionTagTable.java