Comment 12 for bug 1752968

This behavior is not the same as the xul client for editing (replacing) the barcode. In xul the focus means the barcode itself is highlighted so scanning in a barcode deletes what's in the box, replacing it with the new barcode. In the web client the cursor focus is in the box at the end of the barcode so scanning a new barcode adds it to the existing one.

The behavior seems fine when adding a new item as the cursor is at the beginning of the barcode.