title: Flutter : SliverAppBar bottom TabBar not shown / overflow / hidden
body: <p>Flutter - SliverAppBar TabBar not shown</p>
  
  <p>At first I tought the issue is related to flexibleSpace, so I commented it, but the yellow+black borders are still there.</p>
  
  <p><a href="https://youtu.be/FcNMTg6ok4s" rel="nofollow noreferrer">https://youtu.be/FcNMTg6ok4s</a></p>
  
  <p>Youtube VIDEO ^^^</p>
  
  <p><a href="https://i.stack.imgur.com/J7EHq.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/J7EHq.png" alt="enter image description here"></a></p>
  
  <p><a href="https://i.stack.imgur.com/zI1pY.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/zI1pY.png" alt="enter image description here"></a></p>
  
  <pre><code>return new DefaultTabController(
        length: 2,
        child: new Scaffold(
          body: new NestedScrollView(
            headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
              return &lt;Widget&gt;[
                new SliverAppBar(
                  forceElevated: innerBoxIsScrolled,
                  floating: true,
                  //elevation: elevation,
                  pinned: true,
                  expandedHeight: 250.0,
                  bottom: new TabBar(
                    tabs: &lt;Tab&gt;[
                      new Tab(
                        text: 'green',
                        icon: new Icon(Icons.show_chart),
                      ),
                      new Tab(
                        text: 'purple',
                        icon: new Icon(Icons.history),
                      ),
                    ],
                  ),
                  flexibleSpace: new FlexibleSpaceBar(
                    title: new FarsiText(
                      "آقای نوری",
                      style: titleTextStyle,
                    ),
                    centerTitle: true,
                    background: new Container(
                      decoration: new BoxDecoration(
                        gradient: new LinearGradient(
                          begin: const Alignment(0.5, -0.5),
                          end: const Alignment(-1.5, 1.5),
                          colors: &lt;Color&gt;[
                            Colors.purple[400],
                            Colors.lightBlue[100],
                          ],
                        ),
                      ),
                      padding: new EdgeInsets.only(
                        top: screenWidth / 4,
                        bottom: screenWidth / 7,
                      ),
                      child: new Column(
                        children: &lt;Widget&gt;[
                          new Stack(
                            overflow: Overflow.visible,
                            children: &lt;Widget&gt;[
                              new CircleAvatar2(
                                boxShadow: new BoxShadow(
                                  color: Colors.white70,
                                  spreadRadius: 0.0,
                                  blurRadius: 50.0,
                                ),
                                radius: 40.0,
                                backgroundImage:
                                    const AssetImage("assets/images/noori.jpg"),
                              ),
                              new Positioned(
                                child: new Container(
                                  padding: const EdgeInsets.all(3.0),
                                  decoration: new BoxDecoration(
                                    borderRadius: new BorderRadius.all(
                                      const Radius.circular(8.0),
                                    ),
                                    border: new Border.all(
                                      color: Colors.white,
                                      width: 1.5,
                                    ),
                                  ),
                                  child: new FarsiText(
                                    "تایید شده",
                                    color: Colors.white,
                                    fontSize: 15.0,
                                  ),
                                ),
                                left: -100.0,
                              ),
                            ],
                          ),
                        ],
                      ),
                    ),
                  ),
                  leading: getAppBarLeading(context),
                ),
              ];
            },
            body: new TabBarView(
              children: &lt;Widget&gt;[
                new Center(
                  child: new Container(
                    height: 1000.0,
                    color: Colors.green.shade200,
                    child: new Center(
                      child: new FlutterLogo(colors: Colors.green),
                    ),
                  ),
                ),
                new Center(
                  child: new Container(
                    height: 1000.0,
                    color: Colors.purple.shade200,
                    child: new Center(
                      child: new FlutterLogo(colors: Colors.purple),
                    ),
                  ),
                ),
              ],
            ),
          ),
        ),
      );
  </code></pre>