Set editable text to equal string when button from another widget

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I have a widget with a button and an editable text box, and another widget with just an editable text box. What I want to happen is in the first widget when I type into the text box then click on the “enter” button, the text box from the other widget will be set to equal the text that I just typed into the text box from the first widget. I’ve tried a couple different things, but each time when I click on the button nothing will happen. Right now I’m currently trying to just set the second text b