Correctly pass the widget tree to the KeyboardListener so that it wraps the listening area. #16
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Improves: no need to find a place to put BarcodeScannerWidget, adding more complexity into layouts stretching.
Fixes: even properly placed KeyboardListener won't capture keyboard event without a child widget tree (therefore it's required)
Usage:
Old:
Column(children:[
content,
barcodeScannerWidget,
])
New:
BarcodeScannerWidget(children:[
content,
scanners: [
UsbKeyboardScanner(child: content),
],
])