title: Is it possible to somehow indicate that the two widgets have the same state?
body: <p>Suppose there are two identical widgets on different screens in the TabBarView, for example icons and when I change the color of one icon, the second should also change it and repeat all its changes. So it's essentially one element with one View, but in two different places in the tree. My question is, is there any way to make these icons keep a common state or point to the same element in the widget tree. Without any listeners or state management.</p>
  <p>My first idea was to have them have the same key, but that of course didn't work.</p>
  <p>In short, when I create a widget, can I specify that such a widget already exists in the tree and I should use its state and change with it (be duplicated)?</p>