protected Point getCaretPositionOnScreen(JTextField field) {
		if (focus == null) {
			return null;
		}

		FontMetrics metrics = field.getFontMetrics(field.getFont());
		Caret c = field.getCaret();
		Point p = c.getMagicCaretPosition(); // returns a shared reference
		if (p == null) {
			p = new Point(0, field.getBaseline(1, 1));
		}
		else {
			p = new Point(p);
		}
		p.y += metrics.getHeight();
		SwingUtilities.convertPointToScreen(p, field);
		return p;
	}
A convenience function that returns the bottom on-screen position of the given field's caret.

@param field the field, typically the one having focus
@return the on-screen position of the caret's bottom; null if the given field is null
Ghidra/Framework/Docking/src/main/java/docking/widgets/autocomplete/TextFieldAutocompleter.java