fix: remember last selected camera

Author: LittleSound

app/components/Scan.vue

@@ -59,15 +59,15 @@ watchEffect(() => {
     selectedCamera.value = cameras.value[0]?.deviceId
 })
 
-watch(cameras, () => {
-  if (selectedCamera.value && cameras.value.filter(i => i.deviceId === selectedCamera.value).length === 0)
-    selectedCamera.value = ''
-})
-
 // const results = defineModel<Set<string>>('results', { default: new Set() })
 
 let qrScanner: QrScanner | undefined
 
+watch(cameras, () => {
+  if (selectedCamera.value && cameras.value.find(i => i.deviceId === selectedCamera.value))
+    qrScanner?.setCamera(selectedCamera.value)
+})
+
 const error = ref<any>()
 const video = shallowRef<HTMLVideoElement>()
 const videoWidth = ref(0)