@Override
	public Rectangle getCursorBounds(int row, int col) {
		if (row != 0) {
			return null;
		}
		int x = startX;
		return new Rectangle(x, -heightAbove, 2, height);
	}
Returns true if the cursor is allowed past the last character.  This
field always returns false since there is no text.
@return true if the cursor is allowed past the last character
Ghidra/Framework/Docking/src/main/java/docking/widgets/fieldpanel/field/EmptyTextField.java