title: Gesture detector onTap is not triggered
body: <pre><code> Widget build(BuildContext context) {
      return MaterialApp(
          home: Scaffold(
        appBar: AppBar(
          title: Text(&quot;new screen&quot;),
        ),
        body: Column(
          children: [
            Container(
              height: 210,
              decoration: BoxDecoration(color: Colors.white),
              child: Column(
                children: [
                  Stack(
                    children: [
                      GestureDetector(
                          behavior: HitTestBehavior.translucent,
                          onTap: () {
                            Navigator.pop(context);
                          },
                          child: Icon(Icons.arrow_back)),
                      Center(
                        child: Text(
                          'set Destination',
                          style: TextStyle(fontSize: 20),
                        ),
                      ),
                    ],
                  ),
                  SizedBox(
                    height: 18,
                  ),
                  Row(
                    children: [
                      SizedBox(
                        width: 10,
                      ),
                      Expanded(
                          child: Container(
                        decoration: BoxDecoration(
                            color: Colors.grey,
                            borderRadius: BorderRadius.circular(8)),
                        child: Padding(
                          padding: EdgeInsets.all(2),
                          child: TextField(
                            decoration: InputDecoration(
                                hintText: 'Pickup Location',
                                fillColor: Colors.grey,
                                filled: true,
                                border: InputBorder.none,
                                isDense: true,
                                contentPadding:
                                    EdgeInsets.only(left: 10, top: 8, bottom: 8)),
                          ),
                        ),
                      )),
                      SizedBox(
                        width: 10,
                      )
                    ],
                  ),
                  SizedBox(
                    height: 10,
                  ),
                  Row(
                    children: [
                      SizedBox(
                        width: 10,
                      ),
                      Expanded(
                          child: Container(
                        decoration: BoxDecoration(
                            color: Colors.grey,
                            borderRadius: BorderRadius.circular(8)),
                        child: Padding(
                          padding: EdgeInsets.all(2),
                          child: TextField(
                            decoration: InputDecoration(
                                hintText: 'Where to',
                                fillColor: Colors.grey,
                                filled: true,
                                border: InputBorder.none,
                                isDense: true,
                                contentPadding:
                                    EdgeInsets.only(left: 10, top: 8, bottom: 8)),
                          ),
                        ),
                      )),
                      SizedBox(
                        width: 10,
                      )
                    ],
                  )
                ],
              ),
            )
          ],
        ),
      ));
    }
  </code></pre>