Flutter - why is my text is disappearing if i added to much text against its length

Question

As said in the title; my text "disappears" when I added text too much against the length of the textfield, why does this happens??

Here's the code

Container(
                                 height: mediaSize.height * .075,
                                 decoration: BoxDecoration(
                                     borderRadius:
                                         BorderRadius.all(Radius.circular(12.5)),
                                     boxShadow: <BoxShadow>[
                                       BoxShadow(
                                           color: Colors.black54.withOpacity(0.45),
                                           spreadRadius: 1,
                                           blurRadius: 4,
                                           offset: Offset(3.5, 4))
                                     ]),
                                 child: TextFormField(
                                   decoration: InputDecoration(
                                       focusedBorder: OutlineInputBorder(
                                           borderSide:
                                               BorderSide(color: myLightOrangeColor),
                                           borderRadius: BorderRadius.all(
                                               Radius.circular(12.5))),
                                       enabledBorder: OutlineInputBorder(
                                           borderSide: BorderSide(
                                               color: myLightOrangeColor, width: 6),
                                           borderRadius: BorderRadius.all(
                                               Radius.circular(12.5))),
       
                                       labelStyle: TextStyle(color: Colors.black, fontSize: 15, fontWeight: FontWeight.bold),
                                       filled: true,
                                       fillColor: Colors.white),
                                   keyboardType: TextInputType.text,
                                   style: TextStyle(color: Colors.black, fontSize: 15, fontWeight: FontWeight.bold),
                                 ),
                               ),

When I add to much of text this happens: [first one ok] [next one ???]

Answer 1

For the text of the TextField to appear normally it needs his normal height, in the image below an image without giving height to the Container:

But if you give it less height than it need to show the text this happen (in the example the height of the device multiplied by 0.075):

To reduce the height of the TextField you can change the property contentPadding or set the isDense to true:

TextFormField(
  decoration: InputDecoration(
    isDense: true,
    //contentPadding: EdgeInsets.all(0), //or any padding you want
      ),
  keyboardType: TextInputType.text,
  style: TextStyle(
    color: Colors.black,
    fontSize: 15,
    fontWeight: FontWeight.bold,
  ),
),