Because I switch between "Next >" and "Install" button text depending on the selected radio button. Now there's a bug in which I switch the text while the user didn't actually select the ratio button. I can work around it by checking whether the button is actually selected, but it's still a bug.
I found the code you referenced, but still the bug exists and I showed how to reproduce it easily. Looks like the code you provided is not involved in calling the callback in the scenario when focus is changed, but I didn't debug enough to understand why it's called.
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