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flutter 如何设置 AppBar title 和 bottom 的距离?

在保证title 位置不变的情况下, 与tab之间的距离小一点。
image.png

采用 PreferredSize 的话虽然距离会缩小但是 title 的位置也会跟着往上边移动。

new AppBar(
             title: new Text('Tabs Demo'),
             bottom: new PreferredSize(
               preferredSize: new Size(200.0, 30.0),
               child: new Container(
                child: TabBar(...)
               )

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