[FIX] barcodes: allow special keys input on firefox

Install stock_barcode.
It adds a barcode to the product quantity of the inventory adjustment view.
On firefox special characters are ignored (CTRL, BACKSPACE, Fn...)

closes odoo/odoo#29245

addons/barcodes/static/src/js/barcode_field.js

@@ -4,6 +4,7 @@ odoo.define('barcodes.field', function(require) {
 var AbstractField = require('web.AbstractField');
 var basicFields = require('web.basic_fields');
 var fieldRegistry = require('web.field_registry');
+var is_special_key = require('barcodes.BarcodeEvents').BarcodeEvents.is_special_key;
 
 // Field in which the user can both type normally and scan barcodes
 
@@ -41,7 +42,9 @@ var FieldFloatScannable = basicFields.FieldFloat.extend({
     _onKeypress: function (e) {
         /* only simulate a keypress if it has been previously prevented */
         if (e.dispatched_by_barcode_reader !== true) {
-            e.preventDefault();
+            if (!is_special_key(e)) {
+                e.preventDefault();
+            }
             return;
         }
         var character = String.fromCharCode(e.which);