@Override
	public boolean isValid(int row, int col) {
		if (row != 0) {
			return false;
		}

		return ((col >= 0) && (col < getNumCols()));
	}
Checks if any of the textElements need to be clipped. If so, it creates a
new textElement for the element that needs to be clipped that will fit in
the available space. Any textElements past the clipped element will be
ignored.
Ghidra/Framework/Docking/src/main/java/docking/widgets/fieldpanel/field/ClippingTextField.java