Minor Issue: Incorrect usage of Color.fromRGBO in qr_code_scanner

[thdwjdrl401]

First of all, thank you for maintaining the qr_code_scanner package.
While reviewing the code, I noticed that in lib/src/qr_scanner_overlay_shape.dart, the default value for Color.fromRGBO is written as:

Color.fromRGBO(0, 0, 0, 80)

The fourth parameter (opacity) of Color.fromRGBO expects a double value between 0.0 and 1.0, not an int.
Because of this incorrect value, the overlay becomes completely opaque, which is likely not the intended behavior.
Although the application does not immediately crash, the overlay appears fully black instead of being semi-transparent as intended.

This issue seems to have been introduced by an external contributor (Luis Thein), not by the original maintainer.
I fully understand that the project is currently in maintenance mode and that no immediate changes might be made.
However, correcting the value from 80 to 0.8 would better match the intended transparent overlay effect and improve the user experience.

Suggested Fix:

Change:

Color.fromRGBO(0, 0, 0, 80)

to:

Color.fromRGBO(0, 0, 0, 0.8)

(This code is located in lib/src/qr_scanner_overlay_shape.dart.)

Thank you again for your contributions to the Flutter community!

[TimothyGCY]

Thanks for pointing out where I could make the change for my project.
If I'm not mistaken, it's due to breaking change in Flutter 3.27, changing opacity/alpha from int into double