This PR fixes an issue where clicking on an interactive element _inside_
of a `<Label>` component should work as expected.
For example, if you have this situation:
```html
<label for="tac">
<input id="tac" type="checkbox" name="terms-and-conditions" />
I agree to the <a href="terms-and-conditions.html">Terms and Conditions</a>
</label>
```
Clicking on the `<a href="#">` inside the label should _not_ check the
checkbox, but should open the link instead.
Fixes: #3658
Robin Malfait
3e3f45df81