Propagate click behind a widget - flutter

Question

I have a Stack with two widgets inside.
I'm trying to detect the click on the bottom widget of the Stack, which is behind the top one.
I am using HitTestBehavior.translucent, but it only work if the GestureDetector doesn't have any child.
This is a simplified version of what i need in my app. I have a Stack which contains many tiny Cards on the screen, and there's one canvas on top of them all. Despite the canvas, I need to be able to tap on the Cards to change its content. I thought using a translucent behavior would solve my problem but it does not.
EDIT : Also, the first GestureDetector will always be in a Positioned widget.
class TestPage extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: SizedBox(
height: 800,
width: 400,
child: Stack(
children: [
/// 2. ... and trigger the onTap function of this widget
GestureDetector(
behavior: HitTestBehavior.opaque,
onTap: () {
print('TAP BOTTOM');
},
child: Container(
height: 500,
width: 400,
color: Colors.deepOrange,
),
),
/// 1. I'm Trying to clic here...
GestureDetector(
behavior: HitTestBehavior.translucent,
onTap: null,
child: Container(
height: 300,
width: 400,
color: Colors.deepPurple,
),
),
],
),
),
// ),
),
);
}
}

Answer 1

I have a sample code with which you can achieve this:
​class TestPage extends StatelessWidget {
  #override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: SizedBox(
          height: 800,
          width: 400,
          child: Stack(
            children: [
              /// 2. ... and trigger the onTap function of this widget (WIDGET_2)
              GestureDetector(
                behavior: HitTestBehavior.opaque,
                onTap: () {
                  print('TAP BOTTOM');
                },
                child: Container(
                  height: 500,
                  width: 400,
                  color: Colors.deepOrange,
                ),
              ),
              /// Able to tap bottom
              IgnorePointer(
                ignoring: true,
                child: Container(
                  height: 300,
                  width: 400,
                  color: Colors.deepPurple,
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}
Also sorry for posting late here.

Answer 2

The answer was given by VrajGohil on this issue :
https://github.com/flutter/flutter/issues/77596
Here is his solution :
class TestPage extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: SizedBox(
height: 800,
width: 400,
child: Stack(
children: [
/// 2. ... and trigger the onTap function of this widget (WIDGET_2)
GestureDetector(
behavior: HitTestBehavior.opaque,
onTap: () {
print('TAP BOTTOM');
},
child: Container(
height: 500,
width: 400,
color: Colors.deepOrange,
),
),
/// Able to tap bottom
IgnorePointer(
ignoring: true,
child: Container(
height: 300,
width: 400,
color: Colors.deepPurple,
),
),
],
),
),
),
);
}
}