title: Flutter wrong position of text in textfield after changing height
body: <p>According to my design I have a <code>TextField</code> with 30pt of height.</p>
  
  <p>Here's how I am trying to do that:</p>
  
  <pre><code>Container(
              height: 30,
              child: new TextField(
                textAlign: TextAlign.start,
                decoration: new InputDecoration(
                    prefixIcon: Icon(Icons.search),
                    border: new OutlineInputBorder(
                      borderRadius: const BorderRadius.all(
                        const Radius.circular(30.0),
                      ),
                    ),
                    filled: true,
                    hintStyle: new TextStyle(color: Colors.grey[800]),
                    hintText: "Search",
                    fillColor: Colors.lightGreen),
              )),
  </code></pre>
  
  <p>And here's the result:</p>
  
  <p><a href="https://i.stack.imgur.com/ebheX.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ebheX.png" alt="Search"></a> </p>
  
  <p>How can I align hint and text vertically?</p>