title: GoogleMap's onCameraIdle stops firing when in a SingleChildScrollView
body: <p>I have a design where a SingleChildScrollView has a GoogleMap on the first 50% on the screen, and a listing of items in the lower 50%. The user can scroll the entire view up to look at all of the listings. However, at times the Map stops firing the onCameraIdle if the users scrolls the page, and it just won't start firing it again.</p>
  
  <p>onCameraMove and onTap works just fine. It is just onCameraIdle that won't fire.</p>
  
  <pre><code> SingleChildScrollView(
          child: Column(
            children: &lt;Widget&gt;[
              Stack(
                children: &lt;Widget&gt;[
                  Container(
                    height: screenSize.height / 2,
                    child: GoogleMap(
                      key: Key("GMap"),
                      mapType: MapType.normal,
                      markers: Set&lt;Marker&gt;.of(markers.values),
                      gestureRecognizers: Set()
                        ..add(Factory&lt;PanGestureRecognizer&gt;(
                            () =&gt; PanGestureRecognizer()))
                        ..add(
                          Factory&lt;VerticalDragGestureRecognizer&gt;(
                              () =&gt; VerticalDragGestureRecognizer()),
                        )
                        ..add(
                          Factory&lt;HorizontalDragGestureRecognizer&gt;(
                              () =&gt; HorizontalDragGestureRecognizer()),
                        )
                        ..add(
                          Factory&lt;ScaleGestureRecognizer&gt;(
                              () =&gt; ScaleGestureRecognizer()),
                        ),
                      initialCameraPosition: CameraPosition(
                          target: LatLng(14.551620, 121.053329), zoom: 14.5),
                      onMapCreated: (GoogleMapController controller) {
                        if (!_controller.isCompleted) {
                          _controller.complete(controller);
                          _lastCameraPosition = CameraPosition(
                              target: LatLng(14.551620, 121.053329), zoom: 14.5);
                        }
                      },
                      myLocationEnabled: true,
                      myLocationButtonEnabled: true,
                      onCameraIdle: () {
                        print("547: onCameraIdle");
                        _fetchOffers();
                      },
                      onCameraMove: (value) {
                        print("552: onCameraMove");
                        _lastCameraPosition = value;
                      },
                      onTap: (value) {
                        // Load items for current view if deselecting a marker
                        print('556: Tapped outside');
                      },
                    ),
                  ),
                  Positioned(
                    top: 50,
                    right: 20,
                    child: Container(
                      height: 30,
                      decoration: BoxDecoration(
                          border: Border.all(
                              color: _userBalance &gt; 0
                                  ? globals.themeColor4
                                  : globals.themeColor2,
                              width: 2),
                          boxShadow: [
                            BoxShadow(
                              blurRadius: 10.0,
                              color: Colors.black.withOpacity(.5),
                              offset: Offset(3.0, 4.0),
                            ),
                          ],
                          color: Colors.white,
                          borderRadius: BorderRadius.all(Radius.circular(10.0))),
                      child: Center(
                        child: Padding(
                          padding: EdgeInsets.fromLTRB(10, 5, 10, 5),
                          child: Text(
                            "Balance: \u{20B1} ${_userBalance.toStringAsFixed(0)}",
                            style: TextStyle(
                              color: Colors.black,
                              fontSize: 14,
                            ),
                          ),
                        ),
                      ),
                    ),
                  ),
                ],
              ),
              AnimatedContainer(
                color: Colors.white,
                // Use the properties stored in the State class.
                width: double.infinity,
                height: _loaderHeight,
                // Define how long the animation should take.
                duration: Duration(seconds: 1),
                // Provide an optional curve to make the animation feel smoother.
                curve: Curves.fastOutSlowIn,
                child: Center(
                  child: Text(
                    "Loading, please wait",
                    style: TextStyle(color: Colors.grey),
                  ),
                ),
              ),
              Container(
                color: Colors.white,
                child: _offers == null
                    ? Container(
                        child: Padding(
                          padding: EdgeInsets.all(30),
                          child: Row(
                            mainAxisAlignment: MainAxisAlignment.start,
                            children: &lt;Widget&gt;[
                              Icon(MdiIcons.foodAppleOutline,
                                  size: 60, color: globals.themeColor4),
                              Padding(padding: EdgeInsets.only(right: 20)),
                              Expanded(
                                child: Column(
                                  crossAxisAlignment: CrossAxisAlignment.start,
                                  children: &lt;Widget&gt;[
                                    Text("Fetching offers",
                                        style: TextStyle(
                                            color: globals.themeColor4,
                                            fontWeight: FontWeight.bold)),
                                    Padding(padding: EdgeInsets.only(top: 5)),
                                    Text(
                                        "We are fetching offers for you, please hold on...",
                                        style: TextStyle(color: Colors.grey)),
                                  ],
                                ),
                              ),
                            ],
                          ),
                        ),
                      )
                    : Column(children: _offers),
              ),
            ],
          ),
        ),
  </code></pre>
  
  <p>Has anyone encountered this before and have a solution to it?</p>