title: How to send Pointer events to Lower children in Stack
body: <p>As the title says, when using Stacks in flutter, only the "last" rendered children can be interacted with if that child overlaps all other children. In my application i have a ListWheelScrollView which is contained in a Stack, and afterwards "styled" with gradients that lie on top of the ScrollView.</p>
  
  <p>This makes more sense when given an example.</p>
  
  <p>There is an existing issue on almost this exact situation here: <a href="https://stackoverflow.com/questions/52965799/flutter-gesturedetector-not-working-with-containers-in-stack">Flutter- GestureDetector not working with containers in stack</a></p>
  
  <p>However, it assumes you are working with a gesture detector.</p>
  
  <pre><code>Stack(children: &lt;Widget&gt;[
            Container(
              height: 250,
              child: Row(
                mainAxisAlignment: MainAxisAlignment.center,
                children: &lt;Widget&gt;[
                  Container(
                    width: _style.fontSize * 1.5,
                    child: ListWheelScrollView.useDelegate(
                        controller: fixedExtentScrollController,
                        physics: FixedExtentScrollPhysics(),
                        itemExtent: _style.fontSize * 1.5,
                        childDelegate: ListWheelChildLoopingListDelegate(
                            children: hours
                                .map((hour) =&gt; hour &lt; 10
                                    ? Text(
                                        "0$hour",
                                        style: _style,
                                      )
                                    : Text(
                                        "$hour",
                                        style: _style,
                                      ))
                                .toList())),
                  ),
                  Column(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: &lt;Widget&gt;[
                      Text(
                        ":",
                        style: _style,
                      ),
                      SizedBox(
                        height: 25,
                      )
                    ],
                  ),
                  Container(
                    width: _style.fontSize * 1.5,
                    child: ListWheelScrollView.useDelegate(
                        physics: FixedExtentScrollPhysics(),
                        itemExtent: _style.fontSize * 1.5,
                        childDelegate: ListWheelChildLoopingListDelegate(
                            children: minutes
                                .map((minute) =&gt; minute &lt; 10
                                    ? Text(
                                        "0$minute",
                                        style: _style,
                                      )
                                    : Text(
                                        "$minute",
                                        style: _style,
                                      ))
                                .toList())),
                  ),
                ],
              ),
            ),
            Container(
                  height: 250,
                  child: Column(
                    children: &lt;Widget&gt;[
                      Container(
                        height: 75.3,
                        decoration: BoxDecoration(
                            gradient: LinearGradient(
                                begin: Alignment.bottomCenter,
                                end: Alignment.topCenter,
                                colors: [
                              Colors.white.withOpacity(0.1),
                              Theme.of(context).scaffoldBackgroundColor
                            ])),
                      ),
                      Center(
                          child: Container(
                              height: 83.3,
                              width: 220,
                              decoration: BoxDecoration(
                                border: Border.all(
                                    color: Color(0xFFc0ccd4), width: 5),
                              ))),
                    ],
                  ),
            )
          ]),
  </code></pre>
  
  <p>The design works perfectly as expected, however i am no longer able of scrolling since the containers are on top of the scroll widget. </p>
  
  <p>Any workarounds?</p>