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Category "extends"

Flutter Override PopupMenuButton Widget to prevent soft keyboard to close

In my flutter mobile application, I use a PopupMenuButton placed at the bottom of the view. If I click on it, the soft keyboard is dismissed because the text in

incompatible types: Myclass cannot be converted to CAP#1 where CAP#1 is a fresh type-variable:CAP#1 extends Myclass from capture of ? extends Myclass

In code I created user defined class Myclass and Myclass2 which extends Myclass and then used in ArrayList<? extends Myclass> as a arguments that means no

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