@Override
	public boolean isValid(int row, int col) {

		if ((row < 0) || (row >= getNumRows())) {
			return false;
		}

		FieldRow fieldRow = getFieldRow(row);
		int relativeRow = fieldRow.getRelativeRow(row);
		return fieldRow.field.isValid(relativeRow, col);
	}
A {@link TextField} that takes in other TextFields.

<P>This class allows clients to create custom text layout behavior by combining individual
TextFields that dictate layout behavior.  As an example, consider this rendering:
<pre>
	1)  This is some text...
	2)	This
		is
		more
		text
</pre>
In this example, 1) is a row of text inside of a {@link ClippingTextField}.  Row 2) is a
multi-line text rendering specified in a single {@link FlowLayoutTextField}, using a
narrow width to trigger the field to place each element on its own line.
Ghidra/Framework/Docking/src/main/java/docking/widgets/fieldpanel/field/CompositeVerticalLayoutTextField.java