How can I write a statelesswidget? - flutter-widget

I had just started learning flutter and I face a problem that now trying to solve it for three days.
Hope someone can help me.
The problem is that when I am trying to write a stateless widget, it should appear a short cut for it and click enter so it will automatic fill in all the code, but when I press enter it doesn't complete the code it only shows the word that I had written 'StatelessWidget' and of course it shows error with the red pulp.

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enter image description here
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I am making a calculator that keeps all the different sums on the screen using flutter. Not sure how to approach this

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How to make UILabel display multiple lines in the Today Extension?

I have been trying to not ask basic questions on stack overflow, but I cannot find a clue on the Internet related to this problem.
I wish to make my UILabel display multilines in my widget (Today Extension).
The "set lines to 0" solution works in the main app, but this doesn't seem to work within the widget. It keeps displaying only one line with '...' at the end.
Does anybody know how to resolve this issue? I will attach some screenshots to explain my problem further.
Increase the line limit number to 3 or more.
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I know that setting it to '0' is suppose to work however when it comes to alerts and displays it does not always apply. I know that by giving it a number like '3' or '4' it is not dynamic, however, it will solve your problem with the notifications.
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