[FIX] barcode: Avoid making requests to onchange method on each scan
[FIX] barcode: Avoid making requests to onchange method on each scan

Usecase: A person scans various products in a warehouse or the network is slow.
Only one request per product must be made, the rest is changing the number locally
and all performed scans (products or actions) must not be lost.
The mutex ensures that the scan is performed in the correct order.

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