title: How to edit spacing between Flutter's TextFormField input and errorText
body: <p>Is there a way to decrease the spacing between the actual input and the error text in a TextFormField widget? As it stands right now having error texts displayed on the form almost doubles the size of the form and I would like to keep the form area the same size with or without error text. From the pictures below you can see how much change it makes and that there is quite a lot of space between the input and the error message that could use reducing.</p>
  
  <p><a href="https://i.stack.imgur.com/4NeT6.png" rel="noreferrer">Form before errors</a>
  <a href="https://i.stack.imgur.com/FMnQf.png" rel="noreferrer">Form after errors</a></p>
  
  <p>Here is an example of one of the formfields</p>
  
  <pre><code>Padding(
                  padding: EdgeInsets.only(
                      top: 5.0, bottom: 5.0, left: 25.0, right: 25.0),
                  child: TextFormField(
                    focusNode: myFocusNodeName,
                    controller: signupNameController,
                    keyboardType: TextInputType.text,
                    textCapitalization: TextCapitalization.words,
                    style: TextStyle(
                        fontFamily: "WorkSansSemiBold",
                        fontSize: 16.0,
                        color: Colors.black),
                    decoration: InputDecoration(
                      border: InputBorder.none,
                      icon: Icon(
                        FontAwesomeIcons.user,
                        color: Colors.black,
                      ),
                      errorText: signupLastNameErrorText,
                      hintText: "Last Name",
                      hintStyle: TextStyle(
                          fontFamily: "WorkSansSemiBold", fontSize: 16.0),
                    ),
                    validator: (value) =&gt;
                        value.isEmpty ? 'Last Name can\'t be empty' : null,
                    onSaved: (value) =&gt; _lastname = value,
                  ),
                ),
  </code></pre>