An update to my Temperature Converter

Today I updated my Flutter sample app called Temperature Converter. It now makes use of Flutter's InputDecoration to show an error message if the input value is no floating point number. Here is how it looks like:
The following screenshot shows a valid input.
As you can see, the app disables the Calculate button accordingly. This is done by setting the onPressed parameter to null. To find out more, please grab the source at GitHub.

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